Fix the links for the PidFile directive in stopping.html and

add mpm_common and mod_cache to index-bytype.html (which, by the way,
is clearly the abused stepsister of index.xml/index.html... we should
find some automated way to generate the index-bytype as we have with the
regular index).

PR:  9187
Reported by:  Max Dittrich <amax@cs.tu-berlin.de>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@95159 13f79535-47bb-0310-9956-ffa450edef68