Merge r1517406 from trunk:

PR55352: mention in the <Proxy> manual that the matching is a prefix only, not 
the same context-root / segment-aware matching done by <Location>.




git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1559613 13f79535-47bb-0310-9956-ffa450edef68