tower_settings: "get" isn't implemented, "value" parameter is required (#54028)

* tower_settings doc: 'get' isn't implemented

* tower_settings: fix typo in argument_spec

lib/ansible/modules/web_infrastructure/ansible_tower/tower_settings.py

@@ -20,15 +20,17 @@ author: "Nikhil Jain (@jainnikhil30)"
 version_added: "2.7"
 short_description: Modify Ansible Tower settings.
 description:
-    - Get, Modify Ansible Tower settings. See
+    - Modify Ansible Tower settings. See
       U(https://www.ansible.com/tower) for an overview.
 options:
     name:
       description:
-        - Name of setting to get/modify
+        - Name of setting to modify
+      required: True
     value:
       description:
         - Value to be modified for given setting.
+      required: True
 extends_documentation_fragment: tower
 '''
 
@@ -67,8 +69,8 @@ except ImportError:
 
 def main():
     argument_spec = dict(
-        name=dict(Required=True),
-        value=dict(Required=True),
+        name=dict(required=True),
+        value=dict(required=True),
     )
 
     module = TowerModule(