Replace nonsense statement in the backport proposal (the backport has
  merit, but for an altogether different reason).

  http2-wg has no impact on HTTP/1.1 protocol, and Upgrade: request and
  response in this case is defined by the HTTP/1.1 RFC, alone.  An Upgrade
  header in an HTTP/2.0 stream is entirely under the scope of HTTP/2.0 RFC.



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Fix link to distcache. 
http://www.distcache.org/ --> http://distcache.sourceforge.net/

(r1740717 in trunk)

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mod_http2: disabling mmap on file buckets, changing r->protocol to HTTP/2.0


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(r1739045 in trunk)

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Synch with trunk (r1468709 and r1481364)

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Align examples on the left to be consistent
Add some missing <em> in syntax description
Add some hyperlinks to modules and directives
Fix some bogus <directive type="section"> usage
Fix typo
(r1738690 and r1738693 in trunk)

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A recent email in docs@ brought up an interesting use case, namely mixing
mod_access_compact (Order, Deny, Allow) and mod_authz_host (Require) directives
while migrating from 2.2 to 2.4. This is technically possible but it leads
to a lot of confusion due to how config merge works between these modules. This change adds
some examples on the documentation about things that might go wrong when mixing
old and new directives, stating clearly that mod_access_compact or mod_authz_host
should not be used together.



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