fix some homophonic issues in comments, as well as some

mispelings found near "its" or "it's"

(helping our 4th grader with homework, couldn't help but
grep)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@90173 13f79535-47bb-0310-9956-ffa450edef68