[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/datasources/aws-cloudwatch/aws-authentication/index.md

@@ -77,7 +77,9 @@ For more information on why and how to use service endpoints, refer to the [AWS
 
 Create a file at `~/.aws/credentials`, the `HOME` path for the user running the `grafana-server` service.
 
-> **Note:** If you think you have the credentials file in the right location, but it's not working, try moving your `.aws` file to `/usr/share/grafana/` and grant your credentials file at most 0644 permissions.
+{{% admonition type="note" %}}
+If you think you have the credentials file in the right location, but it's not working, try moving your `.aws` file to `/usr/share/grafana/` and grant your credentials file at most 0644 permissions.
+{{% /admonition %}}
 
 ### Credentials file example