add returned values into the documentation. (home-assistant#2041)

Carlo Costanzo · fabaff · commit c789873c8122 · 2017-02-14T17:20:30.000+01:00
There are many phases of the moon.  This sensor returns 4 of them.  I listed them for automation matching.
diff --git a/source/_components/sensor.moon.markdown b/source/_components/sensor.moon.markdown
@@ -23,4 +23,5 @@ To enable the moon sensor, add the following lines to your `configuration.yaml`:
 sensor:
   - platform: moon
 ```
-
+This sensor will return one of the following values: 
+`Full moon`, `Last quarter`, `First quarter` or `New moon`.
