Update http_kernel.rst

Author: DamienDeSousa

components/http_kernel.rst

@@ -742,8 +742,8 @@ look like this::
 
 .. _http-kernel-resource-locator:
 
-Also, note that by default, if the ``_format`` attribute if not set in your request, the value will be ``html``.
-So, if your sub request return something else than ``html`` (like json for instance) you can set it like this::
+Also, note that by default, if the ``_format`` attribute is not set in your request, the value will be ``html``.
+So, if your sub request returns something else than ``html`` (like json for instance) you can set it by setting the ``_format`` attribute on the request::
 
     $request->attributes->set('_format', 'json');