We didn't document the services (#8147)

Adding documentation on how to use the services. Actually, adding documentation on _what_ the service is ;)

source/_components/input_text.markdown

@@ -70,6 +70,50 @@ input_text:
         default: text
 {% endconfiguration %}
 
+### {% linkable_title Services %}
+
+This components provide three services to modify the state of the `input_text`.
+
+| Service | Data | Description |
+| ------- | ---- | ----------- |
+| `set_value` | `value`<br>`entity_id(s)` | Set the value for specific `input_text` entities.
+
 ### {% linkable_title Restore State %}
 
 This component will automatically restore the state it had prior to Home Assistant stopping as long as your entity does **not** have a set value for `initial`. To disable this feature, set a valid value for `initial`.
+
+## {% linkable_title Automation Examples %}
+
+Here's an example using `input_text` in an action in an automation.
+
+{% raw %}
+```yaml
+# Example configuration.yaml entry using 'input_text' in an action in an automation
+input_select:
+  scene_bedroom:
+    name: Scene
+    options:
+      - Select
+      - Concentrate
+      - Energize
+      - Reading
+      - Relax
+      - 'OFF'
+    initial: 'Select'
+input_text:
+  bedroom:
+    name: Brightness
+    
+automation:
+  - alias: Bedroom Light - Custom
+    trigger:
+      platform: state
+      entity_id: input_select.scene_bedroom
+    action:
+      - service: input_text.set_value
+        # Again, note the use of 'data_template:' rather than the normal 'data:' if you weren't using an input variable.
+        data_template:
+          entity_id: input_text.bedroom
+          value: "{{ states('input_select.scene_bedroom') }}"
+```
+{% endraw %}