Clean up some typos in the proxy documentation, and add a

	dictionary for the directive attributes (status, override,
	et cetera) - part of the directive-documentation-normalisation
	effort, and something I've wanted for a long time.  Updated the
	mod_example page to use the links to the dictionary (as an example ;-).


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@79376 13f79535-47bb-0310-9956-ffa450edef68