Sensor device class docs (#5219)

* Sensor device class docs

* Fix binary_sensor copy

* Fix headings

* Add icons screenshot

* Add Empty device_class

* Grammar

* Update customizing-devices.markdown

* Add periods

plugins/configuration.rb

@@ -2,7 +2,7 @@ module Jekyll
   class ConfigurationBlock < Liquid::Block
     TYPE_LINKS = {
       'action'       => '/docs/scripts/',
-      'device_class' => '/components/%{component}/#device_class',
+      'device_class' => '/components/%{component}/#device-class',
       'template'     => '/docs/configuration/templating/',
     }
 

source/_components/binary_sensor.markdown

@@ -11,6 +11,8 @@ footer: true
 
 Binary sensors gather information about the state of devices which have a "digital" return value (either 1 or 0). These can be switches, contacts, pins, etc. These sensors only have two states: **0/off/low/closed/false** and **1/on/high/open/true**.  Knowing that there are only two states allows Home Assistant to represent these sensors in a better way in the frontend according to their functionality.
 
+### {% linkable_title Device Class %}
+
 The way these sensors are displayed in the frontend can be modified in the [customize section](/getting-started/customizing-devices/). The following device classes are supported for binary sensors:
 
 - **None**: Generic on/off. This is the default and doesn't need to be set.

source/_components/sensor.markdown

@@ -9,8 +9,20 @@ sharing: true
 footer: true
 ---
 
-Sensors are gathering information about states and conditions. 
+Sensors are gathering information about states and conditions.
 
 Home Assistant currently supports a wide range of sensors. They are able to display information which are provides by Home Assistant directly, are gathered from web services, and, of course, physical devices. Please check the sidebar for a full list of supported sensor platforms.
 
+### {% linkable_title Device Class %}
 
+The way these sensors are displayed in the frontend can be modified in the [customize section](/docs/configuration/customizing-devices/). The following device classes are supported for sensors:
+
+- **None**: Generic sensor. This is the default and doesn't need to be set.
+- **battery**: Percentage of battery that is left.
+- **humidity**: Percentage of humidity in the air.
+- **temperature**: Temperature in °C or °F.
+
+<p class='img'>
+<img src='/images/screenshots/sensor_device_classes_icons.png' />
+Example of various device class icons for sensors.
+</p>

source/_docs/configuration/customizing-devices.markdown

@@ -71,9 +71,10 @@ homeassistant:
 
 ### {% linkable_title Device Class %}
 
-Device class is currently supported by the following platforms:
+Device class is currently supported by the following components:
 
 * [Binary Sensor](/components/binary_sensor/)
+* [Sensor](/components/sensor/)
 * [Cover](/components/cover/)
 
 ### {% linkable_title Reloading customize %}