fix !extend example (#3390)

guides/configuration-types.rst

@@ -331,20 +331,6 @@ your configuration file. This can be used to create generic 'template' configura
 files (like the ``example.yaml`` above) which can be used for multiple devices,
 using substitutions which are provided on the command line.
 
-Extend
-------
-
-To make changes or add additional configuration to included configurations ``!extend config_id`` can be used, where ``config_id`` is the ID of the configuration to modify.
-For example to set a specific update interval on a common uptime sensor that is shared between configurations:
-
-.. code-block:: yaml
-
-    <<: !include common.yaml
-
-    sensor:
-    - id: !extend uptime_sensor
-      update_interval: 10s
-
 .. _config-packages:
 
 Packages
@@ -543,6 +529,21 @@ platform, it could be constructed like this:
           - switch.turn_off: open_${door_location}_door_switch
           - switch.turn_off: close_${door_location}_door_switch
 
+Extend
+------
+
+To make changes or add additional configuration to included configurations ``!extend config_id`` can be used, where ``config_id`` is the ID of the configuration to modify.
+For example to set a specific update interval on a common uptime sensor that is shared between configurations:
+
+.. code-block:: yaml
+
+    packages:
+      common: !include common.yaml
+
+    sensor:
+    - id: !extend uptime_sensor
+      update_interval: 10s
+
 
 See Also
 --------