remove hardcoded PetApi (#7483)

samples/openapi3/client/features/dynamic-servers/python-experimental/dynamic_servers/api/__init__.py

@@ -1,3 +1,3 @@
 # do not import all apis into this module because that uses a lot of memory and stack frames
 # if you need the ability to import all apis from one package, import them with
-# from {{packageName}.apis import DefaultApi, PetApi
+# from dynamic_servers.apis import UsageApi

samples/openapi3/client/features/dynamic-servers/python-experimental/dynamic_servers/api_client.py

@@ -729,11 +729,13 @@ class Endpoint(object):
     def __call__(self, *args, **kwargs):
         """ This method is invoked when endpoints are called
         Example:
-        pet_api = PetApi()
-        pet_api.add_pet  # this is an instance of the class Endpoint
-        pet_api.add_pet()  # this invokes pet_api.add_pet.__call__()
+
+        api_instance = UsageApi()
+        api_instance.custom_server  # this is an instance of the class Endpoint
+        api_instance.custom_server()  # this invokes api_instance.custom_server.__call__()
         which then invokes the callable functions stored in that endpoint at
-        pet_api.add_pet.callable or self.callable in this class
+        api_instance.custom_server.callable or self.callable in this class
+
         """
         return self.callable(self, *args, **kwargs)
 

samples/openapi3/client/features/dynamic-servers/python-experimental/dynamic_servers/apis/__init__.py

@@ -7,7 +7,7 @@
 # raise a `RecursionError`.
 # In order to avoid this, import only the API that you directly need like:
 #
-#   from .api.pet_api import PetApi
+#   from .api.usage_api import UsageApi
 #
 # or import this package, but before doing it, use:
 #