Merge branch 'jt/doc-post-receive-hook-update'

Doc update.

* jt/doc-post-receive-hook-update:
  doc: clarify post-receive hook behavior

Documentation/githooks.txt

@@ -415,13 +415,13 @@ post-receive
 
 This hook is invoked by linkgit:git-receive-pack[1] when it reacts to
 `git push` and updates reference(s) in its repository.
-It executes on the remote repository once after all the refs have
-been updated.
+The hook executes on the remote repository once after all the proposed
+ref updates are processed and if at least one ref is updated as the
+result.
 
-This hook executes once for the receive operation.  It takes no
-arguments, but gets the same information as the
-<<pre-receive,'pre-receive'>>
-hook does on its standard input.
+The hook takes no arguments.  It receives one line on standard input for
+each ref that is successfully updated following the same format as the
+<<pre-receive,'pre-receive'>> hook.
 
 This hook does not affect the outcome of `git receive-pack`, as it
 is called after the real work is done.
@@ -448,6 +448,9 @@ environment variables will not be set. If the client selects
 to use push options, but doesn't transmit any, the count variable
 will be set to zero, `GIT_PUSH_OPTION_COUNT=0`.
 
+See the "post-receive" section in linkgit:git-receive-pack[1] for
+additional details.
+
 [[post-update]]
 post-update
 ~~~~~~~~~~~