Describe the user name 'variable' in a way that doesn't confuse the textile parser.

railties/guides/source/contributing_to_ruby_on_rails.textile

@@ -361,7 +361,7 @@ $ git push mine my_new_branch
 
 h4. Issue a Pull Request
 
-Navigate to the Rails repository you just pushed to (e.g. https://github.com/<your user name>/rails) and press "Pull Request" in the upper right hand corner.
+Navigate to the Rails repository you just pushed to (e.g. https://github.com/your-user-name/rails) and press "Pull Request" in the upper right hand corner.
 
 Write your branch name in branch field (is filled with master by default) and press "Update Commit Range"