Merge branch '6.4' into 7.0

* 6.4:
  Fix typo in http_client.rst

Author: OskarStark

http_client.rst

@@ -1926,7 +1926,7 @@ assertions on the request before returning the mocked response::
         },
     ];
 
-    $client = new MockHttpClient($expectedRequest);
+    $client = new MockHttpClient($expectedRequests);
 
     // ...