Update configuration.rst

Co-authored-by: Antoine M <[email protected]>

Author: ThomasLandauer

configuration.rst

@@ -298,7 +298,7 @@ reusable configuration value. By convention, parameters are defined under the
 
 Once defined, you can reference this parameter value from any other
 configuration file using a special syntax: wrap the parameter name in two ``%``
-(e.g. ``%app.admin_email%``). In PHP you can also use the ``param()`` function:
+(e.g. ``%app.admin_email%``). In PHP configuration, you can also use the ``param()`` function:
 
 .. configuration-block::