bug symfony#8828 Fixed symfony#8826 (mickaelandrieu)

This PR was merged into the 4.0 branch.

Discussion
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Fixed symfony#8826

Well... where is platform sh pull request website? :D /c @xabbuh

Commits
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18cfa80 Fixed configuration block rendering in routing docs

Author: weaverryan

routing.rst

@@ -22,7 +22,7 @@ Creating Routes
 
 A *route* is a map from a URL path to a controller. Suppose you want one route that
 matches ``/blog`` exactly and another more dynamic route that can match *any* URL
-like ``/blog/my-post`` or ``/blog/all-about-symfony``::
+like ``/blog/my-post`` or ``/blog/all-about-symfony``:
 
 .. configuration-block::