Imply that the remote can be specified to git push

Git can handle more than one remote at a time, and `git push` can push
to many remotes at once.

Author: jmbtutor

understanding-git.tex

@@ -1391,7 +1391,7 @@ \subsection{\gitcmd{push}}
   \frametitle{\gitcmd{push}}
   \framesubtitle{``Update remote refs along with associated objects''}
   \begin{itemize}
-    \item Pushes commits to the remote repository.
+    \item Pushes commits to a remote repository.
     \item Updates the remote branch reference.
     \item Will fail if the remote branch is not an ancestor of the local branch unless \gflag{--force} (\gflag{-f}) is used.
     \item Tags must be pushed separately with the \gflag{--tags} flag.