adds better default option for git-fetch

pages/common/git-fetch.md

@@ -2,6 +2,10 @@
 
 > Download objects and refs from a remote repository
 
+- Fetch new branches and update remote-tracking branches
+
+`git fetch {{remote_name}}`
+
 - Fetch the latest changes from all remote git servers
 
 `git fetch --all`