stdio doc patch

[Eric Blake]

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OK to apply?  I noticed that I failed to properly document fopencookie,
and in the process of fixing that, discovered ungetc was undocumented.

2007-07-13  Eric Blake  <ebb9@byu.net>

	Documentation updates.
	* libc/stdio/ungetc.c: Document ungetc.
	* libc/stdio/Makefile.am (CHEWOUT_FILES): Sort, match current list
	of files with documentation.
	* libc/stdio/Makefile.in: Regenerate.
	* libc/stdio/stdio.tex: Sort and update stdio documentation index.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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