Minimizing of the configuration sample (#1035)

source/_components/group.markdown

@@ -25,7 +25,6 @@ group:
     entities:
       - group.awesome_people
       - group.climate
-
   kitchen:
     name: Kitchen
     entities:

source/_components/scene.markdown

@@ -23,7 +23,6 @@ scene:
         state: on
         xy_color: [0.33, 0.66]
         brightness: 200
-
   - name: Movies
     entities:
       light.tv_back_light:
@@ -32,6 +31,11 @@ scene:
       light.ceiling: off
 ```
 
+Configuration variables:
+
+- **name** (*Required*): Friendly name of scene.
+- **entities** (*Required*): Entities to control.
+
 Scenes can be activated using the service `scene.turn_on` (there is no 'scene.turn_off' service).
 
 ```yaml