Merge r1657854, r1657856 from trunk:

PR57094: Provide some hints about Windows problems 
with more than a few dozen piped loggers.

Submitted by: Edward Lu



add a generic tuning section and linked to the piped logger
issue in logs.html



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1657858 13f79535-47bb-0310-9956-ffa450edef68