Fixed #13453: Corrected typo in template syntax error message. Thanks jheasly.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@13061 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/templatetags/cache.py

@@ -18,7 +18,7 @@ class CacheNode(Node):
         try:
             expire_time = self.expire_time_var.resolve(context)
         except VariableDoesNotExist:
-            raise TemplateSyntaxError('"cache" tag got an unknkown variable: %r' % self.expire_time_var.var)
+            raise TemplateSyntaxError('"cache" tag got an unknown variable: %r' % self.expire_time_var.var)
         try:
             expire_time = int(expire_time)
         except (ValueError, TypeError):