Document what the threadpool MPM is

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@95934 13f79535-47bb-0310-9956-ffa450edef68

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+Threadpool MPM:
+This is an experimental variant of the standard worker MPM.
+Rather than queuing connections like the worker MPM, the threadpool
+MPM queues idle worker threads and hands each accepted connection
+to the next available worker.
+
+The threadpool MPM can't match the performance of the worker MPM
+in benchmark testing.  As of 2.0.39, some of the key load-throtting
+concepts from the threadpool MPM have been incorporated into the
+worker MPM.  The threadpool code is useful primarily as a research
+platform; for general-purpose use, and for any production environments,
+use worker instead.