Fix comment grammar in entity_name test (#2394)

Corrected the comment to use proper grammar.

Author: auvipy

t/unit/transport/test_azureservicebus.py

@@ -362,7 +362,7 @@ def test_custom_entity_name():
     assert channel.entity_name('test-celery') == 'test-celery'
     assert channel.entity_name('test.celery') == 'test-celery'
 
-    # all other punctuations replaced by underscores
+    # all other punctuation's replaced by underscores
     assert channel.entity_name('test_celery') == 'test_celery'
     assert channel.entity_name('test:celery') == 'test_celery'
     assert channel.entity_name('test+celery') == 'test_celery'