Add Light Conditions and Light Triggers section headers (#5462)

Author: andrewjswan

content/components/light/_index.md

@@ -410,6 +410,8 @@ on_...:
 - **white** (*Optional*, [templatable](#config-templatable), percentage): The brightness to set the white channel
   to.
 
+## Light Conditions
+
 {{< anchor "light-is_on_condition" >}}
 {{< anchor "light-is_off_condition" >}}
 
@@ -427,6 +429,8 @@ on_...:
       light.is_on: my_light
 ```
 
+## Light Triggers
+
 {{< anchor "light-on_turn_on_off_trigger" >}}
 
 ### `light.on_turn_on` / `light.on_turn_off` Trigger