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/src/file-io.cc
+++ b/src/file-io.cc
@@ -262,7 +262,7 @@
 stream before calling @code{input}.\n\
 \n\
 @code{fflush} returns 0 on success and an OS dependent error value\n\
-(@minus{}1 on unix) on error.\n\
+(@minus{}1 on Unix) on error.\n\
 @seealso{fopen, fclose}\n\
 @end deftypefn")
 {