doc: miscellaneous touch-ups to documentation strings * debug.txi: Correct line number for debug example. * func.txi: Correct directory structure of functions shipped with Octave distribution. * edit.m: Eliminate reference to editor used by bug_report. * fzero.m: Add inline function to list of possible inputs. * fplot.m: Add comma to break list of possible inputs. * qqplot.m: Correct example so that it runs under current Octave distributions. * assert.m: Add seealso reference to fail. * fail.m: Add seealso reference to assert. Add additional calling forms of function. * load-path.cc (addpath): Don't use @samp which created double double quotes around option. * ov-fcn-inline.cc (vectorize): Add example usage. * variables.cc (exist): Add seealso link to file_in_loadpath.

--- a/scripts/testfun/fail.m
+++ b/scripts/testfun/fail.m
@@ -20,7 +20,8 @@
 ## public domain.
 
 ## -*- texinfo -*-
-## @deftypefn  {Function File} {} fail (@var{code}, @var{pattern})
+## @deftypefn  {Function File} {} fail (@var{code})
+## @deftypefnx {Function File} {} fail (@var{code}, @var{pattern})
 ## @deftypefnx {Function File} {} fail (@var{code}, 'warning', @var{pattern})
 ##
 ## Return true if @var{code} fails with an error message matching
@@ -45,7 +46,7 @@
 ## Called with three arguments, the behavior is similar to
 ## @code{fail(@var{code}, @var{pattern})}, but produces an error if no
 ## warning is given during code execution or if the code fails.
-##
+## @seealso{assert}
 ## @end deftypefn
 
 ## Author: Paul Kienzle <pkienzle@users.sf.net>