[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/dashboards/build-dashboards/create-dashboard-url-variables/index.md

@@ -61,7 +61,9 @@ https://${your-domain}/path/to/your/dashboard?var-adhoc=example_key|=|example_va
 
 The query parameter `var-adhoc=key|=|value` applies the ad hoc filter configured as the `adhoc` dashboard variable using the `example_key` key, the `=` operator, and the `example_value` value.
 
-> **Note:** When sharing URLs with ad hoc filters, remember to encode the URL. In the above example, replace the pipes (`|`) with `%7C` and the equality operator (`=`) with `%3D`.
+{{% admonition type="note" %}}
+When sharing URLs with ad hoc filters, remember to encode the URL. In the above example, replace the pipes (`|`) with `%7C` and the equality operator (`=`) with `%3D`.
+{{% /admonition %}}
 
 ### Example