[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/dashboard_permissions.md

@@ -176,7 +176,9 @@ Status Codes:
 
 ## Get permissions for a dashboard by id
 
-> **Warning:** This API is deprecated since Grafana v9.0.0 and will be removed in a future release. Refer to the [new dashboard permissions API](#get-permissions-for-a-dashboard).
+{{% admonition type="warning" %}}
+This API is deprecated since Grafana v9.0.0 and will be removed in a future release. Refer to the [new dashboard permissions API](#get-permissions-for-a-dashboard).
+{{% /admonition %}}
 
 `GET /api/dashboards/id/:dashboardId/permissions`
 
@@ -257,7 +259,9 @@ Status Codes:
 
 ## Update permissions for a dashboard by id
 
-> **Warning:** This API is deprecated since Grafana v9.0.0 and will be removed in a future release. Refer to the [new dashboard permissions API](#update-permissions-for-a-dashboard).
+{{% admonition type="warning" %}}
+This API is deprecated since Grafana v9.0.0 and will be removed in a future release. Refer to the [new dashboard permissions API](#update-permissions-for-a-dashboard).
+{{% /admonition %}}
 
 `POST /api/dashboards/id/:dashboardId/permissions`