[erlang-patches] Fix minor typos and improve punctuation in the xmerl_xpath @doc comment

[Marcus Marinelli]

git fetch git://github.com/msm/otp.git xmerl_doc_fixes

https://github.com/msm/otp/commit/8a8e05929bb12ee96a0bb92505c3c410be9a5052

Single two-line-diff commit to fix some cosmetic typos and punctuation
in an @doc comment.

Current typos/problems are visible here:
http://www.erlang.org/doc/man/xmerl_xpath.html in the "Module
Description" paragraph.

Cheers,
Marcus