Deduplicate null definition in the ARM logging section

diff --git a/doc/arm/reference.rst b/doc/arm/reference.rst
index ecee2c3eb4581018e3b017ded5440a09de16d310..60feed0ef470991c97e70be6d478c375f7e6741c 100644 (file)
--- a/doc/arm/reference.rst
+++ b/doc/arm/reference.rst
@@ -868,9 +868,7 @@ following:
    };
 
 
-.. namedconf:statement:: null
-
-To discard all messages in a category, specify the ``null`` channel:
+To discard all messages in a category, specify the :namedconf:ref:`null` channel:
 
 ::