modified an error on the config syntax (#1446)

* modified an error on the config syntax 

as stated here
https://home-assistant.io/getting-started/scripts-conditions/
under condition: can't set platform: time but condition: time
* Update automation-examples.markdown
Address feedback from @fabaff

source/getting-started/automation-examples.markdown

@@ -27,10 +27,10 @@ automation:
   condition:
     # Prefix the first line of each condition configuration
     # with a '-'' to enter multiple
-    - platform: state
+    - condition: state
       entity_id: group.all_devices
       state: 'home'
-    - platform: time
+    - condition: time
       after: '16:00:00'
       before: '23:00:00'
   action:
@@ -55,7 +55,7 @@ automation:
     zone: zone.home
     entity_id: device_tracker.paulus
   condition:
-    platform: time
+    condition: time
     after: '20:00'
   action:
     service: notify.notify