[v9.4.x] [feat] docs; update admonition syntax (#68855)

[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

(cherry picked from commit 1c4bb9ca00)

Co-authored-by: Matt Dodson <47385188+MattDodsonEnglish@users.noreply.github.com>

docs/sources/dashboards/variables/inspect-variable/index.md

@@ -17,7 +17,9 @@ weight: 200
 
 The variables page lets you easily identify whether a variable is being referenced (or used) in other variables or dashboard. In addition, you can also [add]({{< relref "./add-template-variables/" >}}) and [manage variables]({{< relref "./add-template-variables/#manage-variables" >}}) on this page.
 
-> **Note:** This feature is available in Grafana 7.4 and later versions.
+{{% admonition type="note" %}}
+This feature is available in Grafana 7.4 and later versions.
+{{% /admonition %}}
 
 ![Variables list](/static/img/docs/variables-templates/variables-list-7-4.png)