Fix documentation of `Action' directive: It can activate a CGI script when

either a handler or a MIME content type is triggered by the request. We forgot
to mention the handler-based variant here.

Submitted by: Andrew Pimlott <pimlott@math.harvard.edu>
Reviewed by: Ralf S. Engelschall
PR: 3340


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@82398 13f79535-47bb-0310-9956-ffa450edef68