More cleanup and link to push documentation

Author: td2014

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

@@ -143,7 +143,10 @@ To jessica@githost:simplegit.git
    1edee6b..fbff5bc  master -> master
 ----
 
-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 git push.
+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].
 
 Continuing with the example, John tries to push his change up, too: