Label the 1.3 documentation as being such in the header and footer.

	Hopefully (!) this will ease some of the confusion about 1.3
	features described therein that people think apply to 1.2..

Reviewed by:	Dean Gaudet


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@79503 13f79535-47bb-0310-9956-ffa450edef68