[PR #10513/3b551f92 backport][stable-11] arg_spec adjustments: modules [t-z]* (#10535)

arg_spec adjustments: modules [t-z]* (#10513)

* arg_spec adjustments: modules [t-z]*

* add changelog frag

(cherry picked from commit 3b551f92fc)

Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>

plugins/modules/vertica_role.py

@@ -180,7 +180,7 @@ def main():
     module = AnsibleModule(
         argument_spec=dict(
             role=dict(required=True, aliases=['name']),
-            assigned_roles=dict(default=None, aliases=['assigned_role']),
+            assigned_roles=dict(aliases=['assigned_role']),
             state=dict(default='present', choices=['absent', 'present']),
             db=dict(),
             cluster=dict(default='localhost'),