Add docs for split visual temperature step (#2691)

components/climate/index.rst

@@ -43,7 +43,10 @@ Configuration variables:
   - **max_temperature** (*Optional*, float): The maximum temperature the climate device can reach.
     Used to set the range of the frontend gauge.
   - **temperature_step** (*Optional*, float): The granularity with which the target temperature
-    can be controlled.
+    can be controlled. Can be a single number, or split as below:
+
+    - **target_temperature** (**Required**, float)
+    - **current_temperature** (**Required**, float)
 
 Advanced options:
 
@@ -58,6 +61,18 @@ Advanced options:
   for a list of available options. Requires Home Assistant 2021.11 or newer.
   Set to ``""`` to remove the default entity category.
 
+
+.. code-block:: yaml
+
+    climate:
+      - platform: ...
+        visual:
+          min_temperature: 18
+          max_temperature: 25
+          temperature_step:
+            target_temperature: 0.5
+            current_temperature: 0.1
+
 Climate Automation
 ------------------