Update Agent notification methods documentation (#14827)

* update health/notifications/README.md

* Alerta notification method documentation update

* Amazon SNS and some alerta changes

* notification methods imporvements

* alerta refinements

* awssns refinements

* custom alert refinements

* discord refinements

* email notifications documentation update

* flock notifications documentation update

* alerta edits

* awssns edits

* custom notification method edits

* discord edits

* email notification method edits

* flock edits

* IRC notifications update

* Kavenegar notifications documentation update

* matrix notifications documentation update

* messagebird notifications documentation update

* msteams notifications documentation update

* wording change

* twilio notifications documentation update

* telegram notifications documentation update

* syslog notifications update

* smstools3 notifications documentation update

* rocket.chat notifications documentation update

* pushover notifications documentation update

* pushbullet notifications documentation update

* prowl notifications documentation update

* pagerduty notifications documentation update

* remove comments from example configuration

* slight wording changes

* more notification methods documentation updates

* slack notification documentation update

* add config options to the notifications Introduction page

* crop image twilio

* crop image slack

* crop image pushover

* crop images pushbullet

* crop image messagebird

* crop image kavenegar

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