Backport r1786113 (Wording/formatting/typo fixes.)

+ s/require/Require/ to help syntax color highlight work correctly. (r1838458 + r1838459 in trunk)

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1838466 13f79535-47bb-0310-9956-ffa450edef68