arg_spec adjustments: modules [o-s]* (#10512)

* arg_spec adjustments: modules [o-s]*

* add changelog frag

plugins/modules/pagerduty.py

@@ -242,15 +242,15 @@ def main():
     module = AnsibleModule(
         argument_spec=dict(
             state=dict(required=True, choices=['running', 'started', 'ongoing', 'absent']),
-            name=dict(required=False),
-            user=dict(required=False),
+            name=dict(),
+            user=dict(),
             token=dict(required=True, no_log=True),
-            service=dict(required=False, type='list', elements='str', aliases=["services"]),
-            window_id=dict(required=False),
-            requester_id=dict(required=False),
-            hours=dict(default='1', required=False),   # @TODO change to int?
-            minutes=dict(default='0', required=False),   # @TODO change to int?
-            desc=dict(default='Created by Ansible', required=False),
+            service=dict(type='list', elements='str', aliases=["services"]),
+            window_id=dict(),
+            requester_id=dict(),
+            hours=dict(default='1'),   # @TODO change to int?
+            minutes=dict(default='0'),   # @TODO change to int?
+            desc=dict(default='Created by Ansible'),
             validate_certs=dict(default=True, type='bool'),
         )
     )