[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/search/_index.md

@@ -30,7 +30,9 @@ Dashboard search is:
 - _Not_ case sensitive
 - Functional across stored _and_ file based dashboards.
 
-> **Note**: You can use your keyboard arrow keys to navigate the results and press `Enter` to open the selected dashboard.
+{{% admonition type="note" %}}
+You can use your keyboard arrow keys to navigate the results and press `Enter` to open the selected dashboard.
+{{% /admonition %}}
 
 The following image shows the search results when you search using dashboard name.
 
@@ -88,7 +90,9 @@ To filter dashboard search result by a tag, complete one of the following steps:
 
   All tags will be shown, and when you select a tag, the dashboard search will be instantly filtered.
 
-> **Note:** When using only a keyboard, press the `tab` key and navigate to the **Filter by tag** drop-down menu, press the down arrow key `▼` to activate the menu and locate a tag, and press `Enter` to select the tag.
+{{% admonition type="note" %}}
+When using only a keyboard, press the `tab` key and navigate to the **Filter by tag** drop-down menu, press the down arrow key `▼` to activate the menu and locate a tag, and press `Enter` to select the tag.
+{{% /admonition %}}
 
 ## Command palette