Update input_text.markdown (#10800)

Adds documentation for improved scene support in input_text.

source/_integrations/input_text.markdown

@@ -81,6 +81,18 @@ This integrations provide three services to modify the state of the `input_text`
 
 This integration 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`.
 
+### Scenes
+
+To set the state of the input_text in a [Scene](/integrations/scene/):
+
+```yaml
+# Example configuration.yaml entry
+scene:
+  - name: Example1
+    entities:
+      input_text.example: Hello!
+```
+
 ## Automation Examples
 
 Here's an example using `input_text` in an action in an automation.