[Python] Fixed docstrings in api.mustache (#6391)

* [Python] Fixed docstrings

Fixes https://github.com/swagger-api/swagger-codegen/issues/9630

* Updated generated files

* Fixed python-experimental

* Updated generated files

* Fully fixed the format of the docstrings

* Updated generated files

* Updated generated files in openapi3

samples/openapi3/server/petstore/python-flask/openapi_server/controllers/pet_controller.py

@@ -17,7 +17,7 @@ def add_pet(pet):  # noqa: E501
     :param pet: Pet object that needs to be added to the store
     :type pet: dict | bytes
 
-    :rtype: Pet
+    :rtype: None
     """
     if connexion.request.is_json:
         pet = Pet.from_dict(connexion.request.get_json())  # noqa: E501
@@ -86,7 +86,7 @@ def update_pet(pet):  # noqa: E501
     :param pet: Pet object that needs to be added to the store
     :type pet: dict | bytes
 
-    :rtype: Pet
+    :rtype: None
     """
     if connexion.request.is_json:
         pet = Pet.from_dict(connexion.request.get_json())  # noqa: E501

samples/openapi3/server/petstore/python-flask/openapi_server/openapi/openapi.yaml

@@ -26,15 +26,6 @@ paths:
       requestBody:
         $ref: '#/components/requestBodies/Pet'
       responses:
-        "200":
-          content:
-            application/xml:
-              schema:
-                $ref: '#/components/schemas/Pet'
-            application/json:
-              schema:
-                $ref: '#/components/schemas/Pet'
-          description: successful operation
         "405":
           description: Invalid input
       security:
@@ -50,15 +41,6 @@ paths:
       requestBody:
         $ref: '#/components/requestBodies/Pet'
       responses:
-        "200":
-          content:
-            application/xml:
-              schema:
-                $ref: '#/components/schemas/Pet'
-            application/json:
-              schema:
-                $ref: '#/components/schemas/Pet'
-          description: successful operation
         "400":
           description: Invalid ID supplied
         "404":

samples/openapi3/server/petstore/python-flask/openapi_server/test/test_pet_controller.py

@@ -41,7 +41,6 @@ class TestPetController(BaseTestCase):
   "status" : "available"
 }
         headers = { 
-            'Accept': 'application/json',
             'Content-Type': 'application/json',
             'Authorization': 'Bearer special-key',
         }
@@ -146,7 +145,6 @@ class TestPetController(BaseTestCase):
   "status" : "available"
 }
         headers = { 
-            'Accept': 'application/json',
             'Content-Type': 'application/json',
             'Authorization': 'Bearer special-key',
         }