docs: improve visibility for CPU & GPU instances (#939)

Author: scaleway-bot

scaleway-async/scaleway_async/instance/v1/api.py

@@ -247,7 +247,7 @@
 
 class InstanceV1API(API):
     """
-    This API allows you to manage your Instances.
+    This API allows you to manage your CPU and GPU Instances.
     """
 
     async def get_server_types_availability(

scaleway/scaleway/instance/v1/api.py

@@ -247,7 +247,7 @@
 
 class InstanceV1API(API):
     """
-    This API allows you to manage your Instances.
+    This API allows you to manage your CPU and GPU Instances.
     """
 
     def get_server_types_availability(