Adjusted links for files being moved into platform/ (were ./, now ../).

Matched up <p></p> & <pre></pre>.
Fixed misspellings.
Fixed links to ../install-tpf.html & ebcdic.html (which should probably be
moved down into platform/).
Changed links to windows.html#test to windows.html@cmdline.
Entities encoded.
Changed bogus <emp> tags to <em>.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88379 13f79535-47bb-0310-9956-ffa450edef68