Add hyphen to git push for man page consistency

Author: td2014

book/05-distributed-git/sections/contributing.asc

@@ -146,7 +146,7 @@ To jessica@githost:simplegit.git
 The last line of the output above shows a useful return message from the push operation.
 The basic format is `<oldref>..<newref> fromref \-> toref`, where `oldref` means the old reference, `newref` means the new reference, `fromref` is the name of the local reference being pushed, and `toref` is the name of the remote reference being updated.
 You'll see similar output like this below in the discussions, so having a basic idea of the meaning will help in understanding the various states of the repositories.
-More details are available in the documentation for https://git-scm.com/docs/git-push[git push].
+More details are available in the documentation for https://git-scm.com/docs/git-push[git-push].
 
 Continuing with the example, John tries to push his change up, too: