Some small issues found in the whole document of Octave 4.4.0.

Summary:
Chapter A.3: redundant "do do"
OCTAVE_EXEC_HOME: function name misplaced
warning: rename "mode_st" to "mode_struct" for consistency; mode state can also be "query"
num2hex: missing '"'
octave_core_file_limit: redundant "is is"; redundant ')'
quad2d, integral2, integral3: replace 'x' into '*' for consistency
warning_ids: "Octave:erase:chararray" misplaced
decic: quote variable "y" and "yp"
pqpnonneg, lsqnonneg: missing ')'
bicg: redundant ';;'
betaincinv: redundant ')'

Possible patch:

diff -ur a/examples/code/embedded.cc b/examples/code/embedded.cc
--- a/examples/code/embedded.cc
+++ b/examples/code/embedded.cc
@@ -33,7 +33,7 @@
       //       exit (status);
       //     }
       //
-      // You may skip this step if you don't need to do do anything
+      // You may skip this step if you don't need to do anything
       // between reading the startup files and telling the interpreter
       // that you are ready to execute commands.

diff -ur a/libinterp/corefcn/defaults.cc b/libinterp/corefcn/defaults.cc
--- a/libinterp/corefcn/defaults.cc
+++ b/libinterp/corefcn/defaults.cc
@@ -339,7 +339,7 @@

 DEFUN (OCTAVE_EXEC_HOME, args, ,
        doc: /* -*- texinfo -*-
-@deftypefn {} {} OCTAVE_HOME ()
+@deftypefn {} {} OCTAVE_EXEC_HOME ()
 Return the name of the top-level Octave installation directory for
 architecture-dependent files.  If not specified separately, the value
 is the same as OCTAVE_HOME@.  OCTAVE_EXEC_HOME corresponds to the
diff -ur a/libinterp/corefcn/error.cc b/libinterp/corefcn/error.cc
--- a/libinterp/corefcn/error.cc
+++ b/libinterp/corefcn/error.cc
@@ -1438,7 +1438,7 @@
 @deftypefnx {} {} warning (@var{warning_struct})
 @deftypefnx {} {@var{warning_struct} =} warning (@dots{})
 @deftypefnx {} {@var{mode_struct} =} warning (@var{state}, @var{mode})
-@deftypefnx {} {} warning (@var{mode_st})
+@deftypefnx {} {} warning (@var{mode_struct})

 Display a warning message or control the behavior of Octave's warning system.

@@ -1530,8 +1530,8 @@
 enable/disable the display of additional information after the warning message
 @end table

-In this case the @var{state} argument may only be @qcode{"on"} or
-@qcode{"off"}.
+In this case the @var{state} argument may only be @qcode{"on"},
+@qcode{"off"}, or @qcode{"query"}.

 Implementation Note: For compatibility with @sc{matlab}, escape sequences in
 @var{template} (e.g., @qcode{"@xbackslashchar{}n"} => newline) are processed
diff -ur a/libinterp/corefcn/hex2num.cc b/libinterp/corefcn/hex2num.cc
--- a/libinterp/corefcn/hex2num.cc
+++ b/libinterp/corefcn/hex2num.cc
@@ -294,7 +294,7 @@
 @end group
 @end example

-With the optional second argument @qcode{"cell}, return a cell array of
+With the optional second argument @qcode{"cell"}, return a cell array of
 strings instead of a character array.
 @seealso{hex2num, hex2dec, dec2hex}
 @end deftypefn */)
diff -ur a/libinterp/corefcn/load-save.cc b/libinterp/corefcn/load-save.cc
--- a/libinterp/corefcn/load-save.cc
+++ b/libinterp/corefcn/load-save.cc
@@ -1799,8 +1799,8 @@
 that Octave will save when writing a crash dump file.

 The limit is measured in kilobytes and is applied to the top-level workspace.
-The name of the crash dump file is is specified by
-@var{octave_core_file_name}).
+The name of the crash dump file is specified by
+@var{octave_core_file_name}.

 If @var{octave_core_file_options} flags specify a binary format, then
 @var{octave_core_file_limit} will be approximately the maximum size of the
diff -ur a/scripts/general/integral2.m b/scripts/general/integral2.m
--- a/scripts/general/integral2.m
+++ b/scripts/general/integral2.m
@@ -88,7 +88,7 @@
 ## @end example
 ##
 ## The result is a volume, which for this constant-value integrand, is just
-## @code{@var{Length} * @var{Width} x @var{Height}}.
+## @code{@var{Length} * @var{Width} * @var{Height}}.
 ##
 ## Example 2 : integrate a triangular region in x-y plane
 ##
diff -ur a/scripts/general/integral3.m b/scripts/general/integral3.m
--- a/scripts/general/integral3.m
+++ b/scripts/general/integral3.m
@@ -89,7 +89,7 @@
 ## @end example
 ##
 ## For this constant-value integrand, the result is a volume which is just
-## @code{@var{Length} * @var{Width} x @var{Height}}.
+## @code{@var{Length} * @var{Width} * @var{Height}}.
 ##
 ## Example 2 : integrate over a spherical volume
 ##
diff -ur a/scripts/general/quad2d.m b/scripts/general/quad2d.m
--- a/scripts/general/quad2d.m
+++ b/scripts/general/quad2d.m
@@ -93,7 +93,7 @@
 ## @end example
 ##
 ## The result is a volume, which for this constant-value integrand, is just
-## @code{@var{Length} * @var{Width} x @var{Height}}.
+## @code{@var{Length} * @var{Width} * @var{Height}}.
 ##
 ## Example 2 : integrate a triangular region in x-y plane
 ##
diff -ur a/scripts/help/warning_ids.m b/scripts/help/warning_ids.m
--- a/scripts/help/warning_ids.m
+++ b/scripts/help/warning_ids.m
@@ -174,8 +174,7 @@
 ## If the @code{Octave:erase:chararray} warning is enabled then the erase
 ## function will issue a warning if the input pattern is a character array
 ## rather than a string or cell array of strings.
-## By default, the @code{Octave:eigs:UnconvergedEigenvalues} warning is
-## enabled.
+## By default, the @code{Octave:erase:chararray} warning is enabled.
 ##
 ## @item Octave:data-file-in-path
 ## If the @code{Octave:data-file-in-path} warning is enabled, a warning is
diff -ur a/scripts/ode/decic.m b/scripts/ode/decic.m
--- a/scripts/ode/decic.m
+++ b/scripts/ode/decic.m
@@ -61,9 +61,9 @@
 ## compute the initial conditions.
 ##
 ## The function typically returns two outputs.  Variable @var{y0_new} is a
-## column vector and contains the consistent initial value of y.  The output
+## column vector and contains the consistent initial value of @var{y}.  The output
 ## @var{yp0_new} is a column vector and contains the consistent initial value
-## of yp.
+## of @var{yp}.
 ##
 ## The optional third output @var{resnorm} is the norm of the vector of
 ## residuals.  If @var{resnorm} is small, @code{decic} has successfully
diff -ur a/scripts/optimization/lsqnonneg.m b/scripts/optimization/lsqnonneg.m
--- a/scripts/optimization/lsqnonneg.m
+++ b/scripts/optimization/lsqnonneg.m
@@ -36,7 +36,7 @@
 ## @var{x0} is an optional initial guess for the solution @var{x}.
 ##
 ## @var{options} is an options structure to change the behavior of the
-## algorithm (@pxref{XREFoptimset,,optimset}.  @code{lsqnonneg} recognizes
+## algorithm (@pxref{XREFoptimset,,optimset}).  @code{lsqnonneg} recognizes
 ## these options: @qcode{"MaxIter"}, @qcode{"TolX"}.
 ##
 ## Outputs:
diff -ur a/scripts/optimization/pqpnonneg.m b/scripts/optimization/pqpnonneg.m
--- a/scripts/optimization/pqpnonneg.m
+++ b/scripts/optimization/pqpnonneg.m
@@ -36,7 +36,7 @@
 ## @var{x0} is an optional initial guess for the solution @var{x}.
 ##
 ## @var{options} is an options structure to change the behavior of the
-## algorithm (@pxref{XREFoptimset,,optimset}.  @code{pqpnonneg} recognizes
+## algorithm (@pxref{XREFoptimset,,optimset}).  @code{pqpnonneg} recognizes
 ## one option: @qcode{"MaxIter"}.
 ##
 ## Outputs:
diff -ur a/scripts/sparse/bicg.m b/scripts/sparse/bicg.m
--- a/scripts/sparse/bicg.m
+++ b/scripts/sparse/bicg.m
@@ -142,7 +142,7 @@
 ## M1fun = @@(x, string) strcmp (string, "notransp") * (M1 \ x) + ...
 ##                      strcmp (string, "transp") * (M1' \ x);
 ## M2fun = @@(x, string) strcmp (string, "notransp") * (M2 \ x) + ...
-##                      strcmp (string, "transp") * (M2' \ x);;
+##                      strcmp (string, "transp") * (M2' \ x);
 ## @end group
 ## @end example
 ##
diff -ur a/scripts/specfun/betaincinv.m b/scripts/specfun/betaincinv.m
--- a/scripts/specfun/betaincinv.m
+++ b/scripts/specfun/betaincinv.m
@@ -55,7 +55,7 @@
 ## The variable @var{y} must be in the interval [0,1], while @var{a} and
 ## @var{b} must be real and strictly positive.
 ##
-## By default, @var{tail} is @qcode{"lower")} and the inverse of the incomplete
+## By default, @var{tail} is @qcode{"lower"} and the inverse of the incomplete
 ## beta function integrated from 0 to @var{x} is computed.  If @var{tail} is
 ## @qcode{"upper"} then the complementary function integrated from @var{x} to 1
 ## is inverted.