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/doc/interpreter/debug.txi
+++ b/doc/interpreter/debug.txi
@@ -55,7 +55,7 @@
 @DOCSTRING(debug_on_error)
 
 @node Leaving Debug Mode
-@section Leavinging Debug Mode
+@section Leaving Debug Mode
 
 To leave the debug mode, use either @code{dbcont} 
 or @code{return}.