Updated help.txt for Windows

Updated help.txt for Windows which had some old content as reported by
mstarks in #225.

Removed stale link to documentation.

Removed the commercial support
section since it doesn't appear that TrendMicro has any interest in it
anymore.

Removed dcid's blog. Doesn't look like his new blog has any new
content and for any intereseted parties there is a link on the OSSEC
website.

Removed version number from body of the file since it is already
displayed at the top of the file correctly.
Merge pull request #229 from awiddersheim/fix_windows_help

Updated help.txt for Windows