[#6328] minor tweak

Author: xabbuh

cookbook/bundles/extension.rst

@@ -115,7 +115,7 @@ Other available loaders are the ``YamlFileLoader``, ``PhpFileLoader`` and
 
 .. caution::
 
-    If you removed the default file with services definitions (i.e.
+    If you removed the default file with service definitions (i.e.
     ``app/config/services.yml``), make sure to also remove it from the
     ``imports`` key in ``app/config/config.yml``.