A-b entities: add info that integration is a building block for other… (#29145)

source/_integrations/air_quality.markdown

@@ -25,3 +25,5 @@ The platforms cover the following levels (if they are available):
 - The N2O (nitrogen oxide) level.
 - The NO (nitrogen monoxide) level.
 - The NO2 (nitrogen dioxide) level.
+
+{% include integrations/building_block_integration.md %}

source/_integrations/alarm_control_panel.markdown

@@ -14,6 +14,9 @@ ha_integration_type: entity
 Home Assistant can give you an interface which is similar to a classic alarm system.
 Please see [manual alarm](/integrations/manual) or [template alarm](/integrations/alarm_control_panel.template) for alarm configuration.
 
+
+{% include integrations/building_block_integration.md %}
+
 ### Services
 
 Depending on features supported by a specific integration alarm may expose the following services:

source/_integrations/binary_sensor.markdown

@@ -25,7 +25,10 @@ Some binary sensors are created automatically when you add a device integration.
 For example, adding the [ecobee integration](/integrations/ecobee/) will create
 a binary sensor to detect room occupancy. Other binary sensors can be created
 manually using the [template integration](/integrations/template/)
-or using an [input boolean helper](/integrations/input_boolean),
+or using an [input boolean helper](/integrations/input_boolean).
+
+
+{% include integrations/building_block_integration.md %}
 
 ### Device Class
 

source/_integrations/button.markdown

@@ -17,8 +17,7 @@ a device or service but remains stateless from the Home Assistant perspective.
 It can be compared to a real live momentary switch, push-button, or some other
 form of a stateless switch.
 
-The button entities cannot be implemented manually, but can be provided by
-other integrations.
+{% include integrations/building_block_integration.md %}
 
 ## The state of a button