Fixed typo in docs/ref/templates/language.txt.

docs/ref/templates/language.txt

@@ -706,5 +706,5 @@ This is a feature for the sake of maintainability and sanity.
 .. seealso::
 
     :doc:`The Templates Reference </ref/templates/index>`
-        Covers built-in tags, built-in filters, using an alternative template,
+        Covers built-in tags, built-in filters, using an alternative template
         language, and more.