Correct spelling mistakes.

sanic/app.py

@@ -580,7 +580,7 @@ class Sanic:
                                                                response)
             except BaseException:
                 error_logger.exception(
-                    'Exception occured in one of response middleware handlers'
+                    'Exception occurred in one of response middleware handlers'
                 )
 
         # pass the response to the correct callback

tests/test_middleware.py

@@ -59,7 +59,7 @@ def test_middleware_response_exception():
     result = {'status_code': None}
 
     @app.middleware('response')
-    async def process_response(reqest, response):
+    async def process_response(request, response):
         result['status_code'] = response.status
         return response