bug symfony#12576 Fix XML syntax of Routing examples (codedmonkey)

This PR was merged into the 4.3 branch.

Discussion
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Fix XML syntax of Routing examples

Fixes the syntax of two XML snippets on the Routing page where an invalid closing tag is shown.

Commits
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a5e48d9 Fix XML syntax

Author: OskarStark

routing.rst

@@ -431,7 +431,6 @@ defined as ``/blog/{slug}``:
 
             <route id="blog_show" path="/blog/{slug}"
                    controller="App\Controller\BlogController::show"/>
-            </route>
         </routes>
 
     .. code-block:: php
@@ -525,7 +524,6 @@ the ``{page}`` parameter using the ``requirements`` option:
 
             <route id="blog_show" path="/blog/{slug}"
                    controller="App\Controller\BlogController::show"/>
-            </route>
         </routes>
 
     .. code-block:: php