Documentation/git-push.txt: correct configuration typo

In the EXAMPLES section, git-push(1) says that 'git push origin' pushes
the current branch to the value of the 'remote.origin.merge'
configuration.

This wording (which dates back to b2ed944 (push: switch default from
"matching" to "simple", 2013-01-04)) is incorrect. There is no such
configuration as 'remote.<name>.merge'. This likely was originally
intended to read "branch.<name>.merge" instead.

Indeed, when 'push.default' is 'simple' (which is the default value, and
is applicable in this scenario per "without additional configuration"),
setup_push_upstream() dies if the branch's local name does not match
'branch.<name>.merge'.

Correct this long-standing typo to resolve some recent confusion on the
intended behavior of this example.

Reported-by: Adam Sharafeddine <[email protected]>
Reported-by: Fabien Terrani <[email protected]>
Signed-off-by: Taylor Blau <[email protected]>
Reviewed-by: Jonathan Nieder <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: ttaylorr

Documentation/git-push.txt

@@ -600,7 +600,7 @@ EXAMPLES
 
 `git push origin`::
 	Without additional configuration, pushes the current branch to
-	the configured upstream (`remote.origin.merge` configuration
+	the configured upstream (`branch.<name>.merge` configuration
 	variable) if it has the same name as the current branch, and
 	errors out without pushing otherwise.
 +