[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/administration/plugin-management/index.md

@@ -49,7 +49,9 @@ With [RBAC]({{< relref "../roles-and-permissions/access-control/#about-rbac" >}}
 
 By default, Viewers, Editors and Admins have access to all App Plugins that their organization role allows them to access, thanks to the `fixed:plugins.app:reader` role.
 
-> **Note:** Revoking this RBAC role from some users, will prevent them from accessing app plugins. But granting this RBAC role to users will only allow them to see app plugins their organization role allows them to see.
+{{% admonition type="note" %}}
+Revoking this RBAC role from some users, will prevent them from accessing app plugins. But granting this RBAC role to users will only allow them to see app plugins their organization role allows them to see.
+{{% /admonition %}}
 
 To prevent users from seeing an app plugin, refer to [this permissions scenarios]({{< relref "../roles-and-permissions/access-control/plan-rbac-rollout-strategy#prevent-viewers-from-accessing-an-app-plugin" >}}).
 
@@ -197,7 +199,9 @@ If you've allowed loading of an unsigned plugin, then Grafana writes a warning m
 WARN[06-01|16:45:59] Running an unsigned plugin   pluginID=<plugin id>
 ```
 
-> **Note:** If you're developing a plugin, then you can enable development mode to allow all unsigned plugins.
+{{% admonition type="note" %}}
+If you're developing a plugin, then you can enable development mode to allow all unsigned plugins.
+{{% /admonition %}}
 
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