Mention notable things added in 2.4.x

Mention mod_macro, mod_wstunnel, mod_authnz_fcgi and a few other notable
features that were added post 2.4.0



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   * mod_authn_dbd: Precedence issue. Fix the error message logged in case of
     error while querying the database.

Submitted by: jailletc36
Reviewed by: jailletc36, mrumph, minfrin
Backported by: jailletc36

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   * mod_proxy_connect: fix duplicated AH introduced by r1635645
      (and merged to 2.4.11 in r1642857)

Submitted by: ylavic
Reviewed by: ylavic, jailletc36, minfrin
Backported by: jailletc36

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+ be consistent with the position of '*'

backport r1659848

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Fix typo already fixed in trunk (missing part of r1648557 ; the other fixes have been done in r1648559)

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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



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mod_authnz_fcgi.c: Silence compiler warnings:

- modules/aaa/mod_authnz_fcgi.c:705: warning:
  'orspbuflen' may be used uninitialized in
  this function
- modules/aaa/mod_authnz_fcgi.c:1235: warning:
  comparison is always false due to limited
  range of data type

Submitted by: rjung
Reviewed by: rjung, ylavic, jailletc36
Backported by: rjung


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