Rearrange placement of the encoding argument description in documenta…

docs/reference.rst

@@ -816,9 +816,6 @@ An optional ``str_expr`` can be used to match the MQTT message data, and the tri
 if that expression evaluates to ``True`` or non-zero. This expression has available these
 variables:
 
-An optional ``encoding`` argument specifies the character encoding used to decode the MQTT payload
-(default is **"utf-8"**). It can be explicitly set to other encodings if necessary.
-
 - ``trigger_type`` is set to "mqtt".
 - ``topic`` is set to the topic the message was received on.
 - ``qos`` is set to the message QoS.
@@ -828,6 +825,9 @@ An optional ``encoding`` argument specifies the character encoding used to decod
   required function argument an exception will be thrown, use payload_obj=None.
 - ``retain`` is set to the message retain flag. True if the message was retained, False otherwise.
 
+An optional ``encoding`` argument specifies the character encoding used to decode the MQTT payload
+(default is **"utf-8"**). It can be explicitly set to other encodings if necessary.
+
 When the ``@mqtt_trigger`` occurs, those same variables are passed as keyword arguments to the
 function in case it needs them. Additional keyword parameters can be specified by setting the
 optional ``kwargs`` argument to a ``dict`` with the keywords and values.