Add spellchecker scripts for Octave and run spellcheck of documentation interpreter/doccheck: New directory for spelling/grammar scripts. interpreter/doccheck/README: Instructions for using scripts. interpreter/doccheck/spellcheck: Script to spellcheck a Texinfo file. interpreter/doccheck/aspell.conf: GNU Aspell configuration file for Octave documentation. interpreter/doccheck/aspell-octave.en.pws: Private Aspell dictionary. interpreter/doccheck/add_to_aspell_dict: Script to add new Octave-specific words to private Aspell dictionary. interpreter/octave.texi: New @nospell macro which forces Aspell to ignore the word marked by the macro. interpreter/mk_doc_cache.m: Skip new @nospell macro when building doc_cache.

--- a/scripts/miscellaneous/perl.m
+++ b/scripts/miscellaneous/perl.m
@@ -19,7 +19,7 @@
 ## -*- texinfo -*-
 ## @deftypefn {Function File} {[@var{output}, @var{status}] =} perl (@var{scriptfile})
 ## @deftypefnx {Function File} {[@var{output}, @var{status}] =} perl (@var{scriptfile}, @var{argument1}, @var{argument2}, @dots{})
-## Invoke perl script @var{scriptfile} with possibly a list of
+## Invoke Perl script @var{scriptfile} with possibly a list of
 ## command line arguments.
 ## Returns output in @var{output} and status
 ## in @var{status}.