Add debugging info to the HttpProtocolOption directive doc

In bugzilla and users@ we keep receiving questions about
how to test the new restrictions imposed by HttpProtocolOptions.
Added some info about how to use openssl s_client properly
and the mod_dumpio's directives to debug (thanks to
Daniel Ferradal for this suggestion).



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* mod_auth_digest: Use anonymous shm by default, fall back on name-based.

Submitted by: jkaluza
Reviewed by: jorton, ylavic, jim


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mod_filter: Fix AddOutputFilterByType with non-content-level filters.
PR: 58856

Submitted by: Micha Lenk
Reviewed by: covener, jim, ylavic


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Use pconf as parent pool so mutexes get cleaned on restarts/reloads

name changes re: suggestion

Submitted by: jim
Reviewed by: jim, jorton, ylavic


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Add more info about the role of Timeout for mod_cgi

PR 60404 asks if the Timeout directive is related to
the amount of time to wait for the entire CGI script's
output or only the first byte received.
Checking in mod_cgi.c -> cgi_bucket_read shows a
apr_pollset_poll that should support the latter.



Reworded the Timeout documentation about mod_cgi[d]

After a chat with Yann and Eric on dev@, we agreed to
simplify the description.



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Merge of r1779979,1780159,1780576,1780596 from trunk:
M    modules/http2/h2_bucket_beam.c
     fix for possible duplicate free of send/recv pools
M    modules/http2/h2_from_h1.c
     suppress generating responses on aborted slave connections
M    modules/http2/h2_session.c
     regression: stream ongoing streams on graceful shutdown to the end
M    modules/http2/h2_version.h



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