Sync with 2.5.3

* maint:
Git 2.5.3

diff --combined Documentation/git.txt
index 75ffb16d965d7c5f5b04c8aa342e940566bf8d3c,2b39aa9f5153846884e4a280102e01f4aad357d1..8b2dede3e949b5178f9aa41c5aee4e27f228a077
--- 1/Documentation/git.txt
--- 2/Documentation/git.txt
+++ b/Documentation/git.txt
@@@ -43,9 -43,10 +43,10 @@@ unreleased) version of Git, that is ava
  branch of the `git.git` repository.
  Documentation for older releases are available here:
  
- * link:v2.5.2/git.html[documentation for release 2.5.2]
+ * link:v2.5.3/git.html[documentation for release 2.5.3]
  
  * release notes for
+   link:RelNotes/2.5.3.txt[2.5.3],
    link:RelNotes/2.5.2.txt[2.5.2],
    link:RelNotes/2.5.1.txt[2.5.1],
    link:RelNotes/2.5.0.txt[2.5].
@@@ -1015,20 -1016,9 +1016,20 @@@ Unsetting the variable, or setting it t
        Enables trace messages for all packets coming in or out of a
        given program. This can help with debugging object negotiation
        or other protocol issues. Tracing is turned off at a packet
 -      starting with "PACK".
 +      starting with "PACK" (but see 'GIT_TRACE_PACKFILE' below).
        See 'GIT_TRACE' for available trace output options.
  
 +'GIT_TRACE_PACKFILE'::
 +      Enables tracing of packfiles sent or received by a
 +      given program. Unlike other trace output, this trace is
 +      verbatim: no headers, and no quoting of binary data. You almost
 +      certainly want to direct into a file (e.g.,
 +      `GIT_TRACE_PACKFILE=/tmp/my.pack`) rather than displaying it on
 +      the terminal or mixing it with other trace output.
 ++
 +Note that this is currently only implemented for the client side
 +of clones and fetches.
 +
  'GIT_TRACE_PERFORMANCE'::
        Enables performance related trace messages, e.g. total execution
        time of each Git command.