Fix another batch of spelling typos (#13915)

* Fix typos

* Remove repeated words

* Minor grammar fixes

samples/openapi3/server/petstore/python-flask/git_push.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 # ref: https://help.github.com/articles/adding-an-existing-project-to-github-using-the-command-line/
 #
-# Usage example: /bin/sh ./git_push.sh wing328 openapi-pestore-perl "minor update" "gitlab.com"
+# Usage example: /bin/sh ./git_push.sh wing328 openapi-petstore-perl "minor update" "gitlab.com"
 
 git_user_id=$1
 git_repo_id=$2

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

@@ -32,7 +32,7 @@ def get_inventory():  # noqa: E501
 def get_order_by_id(order_id):  # noqa: E501
     """Find purchase order by ID
 
-    For valid response try integer IDs with value <= 5 or > 10. Other values will generated exceptions # noqa: E501
+    For valid response try integer IDs with value <= 5 or > 10. Other values will generate exceptions # noqa: E501
 
     :param order_id: ID of pet that needs to be fetched
     :type order_id: int

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

@@ -367,7 +367,7 @@ paths:
       x-openapi-router-controller: openapi_server.controllers.store_controller
     get:
       description: For valid response try integer IDs with value <= 5 or > 10. Other
-        values will generated exceptions
+        values will generate exceptions
       operationId: get_order_by_id
       parameters:
       - description: ID of pet that needs to be fetched
@@ -495,7 +495,7 @@ paths:
                 type: integer
               style: simple
             X-Expires-After:
-              description: date in UTC when toekn expires
+              description: date in UTC when token expires
               explode: false
               schema:
                 format: date-time

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

@@ -17,7 +17,7 @@ from openapi_server.test import BaseTestCase
 class TestPetController(BaseTestCase):
     """PetController integration test stubs"""
 
-    @unittest.skip("Connexion does not support multiple consummes. See https://github.com/zalando/connexion/pull/760")
+    @unittest.skip("Connexion does not support multiple consumes. See https://github.com/zalando/connexion/pull/760")
     def test_add_pet(self):
         """Test case for add_pet
 
@@ -121,7 +121,7 @@ class TestPetController(BaseTestCase):
         self.assert200(response,
                        'Response body is : ' + response.data.decode('utf-8'))
 
-    @unittest.skip("Connexion does not support multiple consummes. See https://github.com/zalando/connexion/pull/760")
+    @unittest.skip("Connexion does not support multiple consumes. See https://github.com/zalando/connexion/pull/760")
     def test_update_pet(self):
         """Test case for update_pet