fix index directive syntax

xabbuh · xabbuh · commit b56797e91d0f · 2016-08-03T20:39:12.000+02:00
diff --git a/routing/conditions.rst b/routing/conditions.rst
@@ -1,5 +1,5 @@
 .. index::
-    :single: Routing; Conditions
+    single: Routing; Conditions
 
 How to Restrict Route Matching through Conditions
 =================================================
