Fix indentation of async_register call for search_items service (#2845)

Author: wlcrs

docs/dev_101_services.md

@@ -324,13 +324,13 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
             ],
         }
 
-        hass.services.async_register(
-            DOMAIN,
-            SEARCH_ITEMS_SERVICE_NAME,
-            search_items,
-            schema=SEARCH_ITEMS_SCHEMA,
-            supports_response=SupportsResponse.ONLY,
-        )
+    hass.services.async_register(
+        DOMAIN,
+        SEARCH_ITEMS_SERVICE_NAME,
+        search_items,
+        schema=SEARCH_ITEMS_SCHEMA,
+        supports_response=SupportsResponse.ONLY,
+    )
 ```
 
 The use of response data is meant for cases that do not fit the Home Assistant state. For example, a response stream of objects. Conversely, response data should not be used for cases that are a fit for entity state. For example, a temperature value should just be a sensor.