[xml] [patch] Patch for the manpages (typo-fixes and improvements)

[Daniel Leidert <daniel leidert spam gmx net>]

Hello,

Once again. Attached is a patch for the xmlcatalog and xmllint manpages,
that should fix a few typos and fix the manpage section content (e.g.
moved some stuff to "SEE ALSO"). I further tried to complete the
"ENVIRONMENT" section and added some "missing" markup.

Regards, Daniel

Attachment: libxml2_manpages_patch.diff
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