Fixed a few typos.

Fixed some HTML tags (case, href/name/id)
Added a mention of multiple 'arguments' to allow/deny, and an example. This should probably be more explicit, but I'm not sure of the details (should we show with leading/trailing periods, and explain that IPs are assumed to be the left side, but hostnames are assumed to be the right side?).
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92414 13f79535-47bb-0310-9956-ffa450edef68