Add AirGradient number platform (#33377)

source/_integrations/airgradient.markdown

@@ -12,7 +12,9 @@ ha_codeowners:
   - '@joostlek'
 ha_domain: airgradient
 ha_platforms:
+  - number
   - sensor
+  - select
 ha_integration_type: device
 ha_zeroconf: true
 ---
@@ -25,12 +27,6 @@ In order for the device to be set up or discovered by Home Assistant, the firmwa
 
 </div>
 
-<div class='note'>
-
-In order for the device to be set up or discovered by Home Assistant, the firmware version should be at least 3.1.1.
-
-</div>
-
 {% include integrations/config_flow.md %}
 
 ## Available sensors
@@ -53,7 +49,9 @@ The integration will fetch data from each device. The following sensors are supp
 ## Available configuration entities
 
 The integration provides a few configuration entities to customize the device experience.
-The settings are only applied to the device when the configuration source is set to local.
+The settings are only available when the configuration source is set to local.
 The following entities are supported:
 
 - Display temperature unit
+- Display brightness
+- LED bar brightness