Added in helpful tip (#1472)

* Added in helpful tip

Excluding entries in logbook every 3 minutes.

* Update cover.garadget.markdown

source/_components/cover.garadget.markdown

@@ -89,3 +89,12 @@ customize:
     icon: mdi:wifi
 ```
 
+Some of the Garadget sensors can create a lot of clutter in the logbook.  Use this section of code in your `configuration.yaml` to exclude those entries.
+
+```yaml
+logbook:
+  exclude:
+    entities:
+      - sensor.garage_door_time_in_state
+      - sensor.garage_door_wifi_signal_strength
+```