Fix spelling in API documentation

Author: cecille

docs/testing/ChipDeviceCtrlAPI.md

@@ -384,7 +384,7 @@ right timeout value based on transport characteristics as well as the responsive
 
 **Returns**:
 
-  - command respone. The type of the response is defined by the command.
+  - command response. The type of the response is defined by the command.
 
 **Raises**:
 

src/controller/python/chip/ChipDeviceCtrl.py

@@ -914,7 +914,7 @@ async def SendCommand(self, nodeid: int, endpoint: int, payload: ClusterObjects.
                               right timeout value based on transport characteristics as well as the responsiveness of the target.
 
         Returns:
-            - command respone. The type of the response is defined by the command.
+            - command response. The type of the response is defined by the command.
         Raises:
             - InteractionModelError on error
         '''