[feat] docs; update admonition syntax (#68842)

* [feat] docs; update admonition syntax

- Standardizes according to style conventions: https://grafana.com/docs/writers-toolkit/style-guide/style-conventions/#admonitions
- Prepares docs for better, uniform admonition style.

* Remove false positives and irregularities

* false positive removal

* Update docs/sources/datasources/mysql/_index.md

* Update docs/sources/developers/angular_deprecation/angular-plugins.md

* fix link errors

* Prettify some nested blockquotes

* remoe unnecessary admonition

docs/sources/developers/http_api/admin.md

@@ -192,7 +192,9 @@ Content-Type: application/json
 
 `PUT /api/admin/settings`
 
-> **Note:** Available in Grafana Enterprise v8.0+.
+{{% admonition type="note" %}}
+Available in Grafana Enterprise v8.0+.
+{{% /admonition %}}
 
 Updates / removes and reloads database settings. You must provide either `updates`, `removals` or both.
 
@@ -471,7 +473,9 @@ Content-Type: application/json
 
 `POST /api/admin/pause-all-alerts`
 
-> **Note:** This API is relevant for the [legacy dashboard alerts](https://grafana.com/docs/grafana/v8.5/alerting/old-alerting/) only. For default alerting, use silences to stop alerts from being delivered.
+{{% admonition type="note" %}}
+This API is relevant for the [legacy dashboard alerts](https://grafana.com/docs/grafana/v8.5/alerting/old-alerting/) only. For default alerting, use silences to stop alerts from being delivered.
+{{% /admonition %}}
 
 Only works with Basic Authentication (username and password). See [introduction](http://docs.grafana.org/http_api/admin/#admin-api) for an explanation.