Clean up Grafana docs a bit (#37516)

* Clean up Grafana docs a bit

But more is needed, default values, missing choices, proper
descriptions, actual sentences :-)

* Remove validate-modules entries

lib/ansible/modules/monitoring/grafana_plugin.py

@@ -1,7 +1,7 @@
 #!/usr/bin/python
 # -*- coding: utf-8 -*-
-#
-# Copyright 2017, Thierry Sallé (@tsalle)
+
+# Copyright: (c) 2017, Thierry Sallé (@tsalle)
 # GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
 
 from __future__ import absolute_import, division, print_function
@@ -16,20 +16,20 @@ DOCUMENTATION = '''
 ---
 module: grafana_plugin
 author:
-  - "Thierry Sallé (@tsalle)"
+  - Thierry Sallé (@tsalle)
 version_added: "2.5"
 short_description: Manage Grafana plugins via grafana-cli
 description:
   - Install and remove Grafana plugins.
 options:
   name:
-    required: true
     description:
       - Name of the plugin.
+    required: true
   version:
     description:
       - Version of the plugin to install.
-      - Default to latest
+      - Default to latest.
   grafana_plugins_dir:
     description:
       - Directory where Grafana plugin will be installed.
@@ -38,19 +38,19 @@ options:
       - Grafana repository. If not set, gafana-cli will use the default value C(https://grafana.net/api/plugins).
   grafana_plugin_url:
     description:
-      - Custom Grafana plugin URL
-      - Require grafana 4.6.x or later
+      - Custom Grafana plugin URL.
+      - Requires grafana 4.6.x or later.
   state:
-    default: present
-    choices: [present, absent]
     description:
       - Status of the Grafana plugin.
       - If latest is set, the version parameter will be ignored.
+    choices: [ absent, present ]
+    default: present
 '''
 
 EXAMPLES = '''
 ---
-- name: install - update Grafana piechart panel plugin
+- name: Install - update Grafana piechart panel plugin
   grafana_plugin:
     name: grafana-piechart-panel
     version: latest