Changed the default text of the 404 message from "File Not Found"

	to simply "Not Found", as described in RFC2068.  After all, the
	request might have been for a non-file resource.  Oh, and de-TABbed
	the CHANGES file.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@78514 13f79535-47bb-0310-9956-ffa450edef68