[#9836] fix a minor typo

Author: xabbuh

testing/profiling.rst

@@ -22,7 +22,7 @@ the ``test`` environment)::
             $client = static::createClient();
 
             // enable the profiler only for the next request (if you make
-            // new requests, you must call to this method again)
+            // new requests, you must call this method again)
             // (it does nothing if the profiler is not available)
             $client->enableProfiler();