Add battery sensors to august integration (home-assistant#12170)

* Add battery sensors

* Update august.markdown

Grammar fixes

source/_integrations/august.markdown

@@ -5,6 +5,7 @@ logo: august.png
 ha_category:
   - Doorbell
   - Binary Sensor
+  - Sensor 
   - Camera
   - Lock
 ha_release: 0.64
@@ -19,6 +20,7 @@ There is currently support for the following device types within Home Assistant:
 
 - Doorbell
 - Binary Sensor
+- Sensor
 - Camera
 - Lock
 
@@ -64,16 +66,30 @@ Once Home Assistant is started, a configurator will pop up asking you to enter v
 
 ### Binary Sensor
 
-If you have August Doorbell, once you have enabled the August component, you should see following sensors:
+If you have an August Doorbell, once you have enabled the August component, you should see following sensors:
 
 - Doorbell ding sensor
 - Doorbell motion sensor
 - Doorbell online sensor
 
-If you have August Smart Lock with DoorSense, once you have enabled the August component, you should see the following sensors:
+If you have an August Smart Lock with DoorSense, once you have enabled the August component, you should see the following sensors:
 
 - Door sensor
 
 ### Camera
 
 The `august` camera platform allows you to view the latest camera image (triggered by motion) by your [August](https://august.com/) device in Home Assistant.
+
+### Sensor
+
+If you have an August Doorbell with a battery, once you have enabled the August component, you should see the following sensors:
+
+- Doorbell Battery
+
+If you have an August Smart Lock, once you have enabled the August component, you should see the following sensors:
+
+- Lock Battery
+
+If you have an August Keypad, once you have enabled the August component, you should see the following sensors:
+
+- Keypad Battery