Tidy up validate-modules ignores for notification modules (#1229) (#1232)

* fixed validation-modules for plugins/modules/notification/bearychat.py

* fixed validation-modules for plugins/modules/notification/campfire.py

* fixed validation-modules for plugins/modules/notification/catapult.py

* fixed validation-modules for plugins/modules/notification/flowdock.py

* fixed validation-modules for plugins/modules/notification/grove.py

* fixed validation-modules for plugins/modules/notification/hipchat.py

* fixed validation-modules for plugins/modules/notification/irc.py

* fixed validation-modules for plugins/modules/notification/jabber.py

* fixed validation-modules for plugins/modules/notification/logentries_msg.py

* fixed validation-modules for plugins/modules/notification/mail.py

* fixed validation-modules for plugins/modules/notification/matrix.py

* fixed validation-modules for plugins/modules/notification/mattermost.py

* fixed validation-modules for plugins/modules/notification/mqtt.py

* fixed validation-modules for plugins/modules/notification/nexmo.py

* fixed validation-modules for plugins/modules/notification/office_365_connector_card.py

* fixed some docs issues in plugins/modules/notification/pushbullet.py, but cannot remove the ignore lines yet

* fixed validation-modules for plugins/modules/notification/pushover.py

* fixed some docs issues in plugins/modules/notification/rocketchat.py, but cannot remove all ignore lines yet

* fixed validation-modules for plugins/modules/notification/say.py

* fixed validation-modules for plugins/modules/notification/sendgrid.py

* fixed validation-modules for plugins/modules/notification/slack.py

* fixed validation-modules for plugins/modules/notification/syslogger.py

* fixed validation-modules for plugins/modules/notification/telegram.py

* fixed validation-modules for plugins/modules/notification/twilio.py

* fixed validation-modules for plugins/modules/notification/typetalk.py

* Enabling validation-modules for modules in: notification

* removed naughty trailing space

(cherry picked from commit 24f780ec9a)

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

plugins/modules/notification/pushover.py

@@ -20,26 +20,34 @@ notes:
      is required to receive messages.
 options:
   msg:
+    type: str
     description:
       - What message you wish to send.
     required: true
   app_token:
+    type: str
     description:
       - Pushover issued token identifying your pushover app.
     required: true
   user_key:
+    type: str
     description:
       - Pushover issued authentication key for your user.
     required: true
   title:
+    type: str
     description:
       - Message title.
     required: false
   pri:
+    type: str
     description:
       - Message priority (see U(https://pushover.net) for details).
     required: false
+    default: '0'
+    choices: [ '-2', '-1', '0', '1', '2' ]
   device:
+    type: str
     description:
       - A device the message should be sent to. Multiple devices can be specified, separated by a comma.
     required: false