[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/graphite/query-editor/index.md

@@ -66,8 +66,10 @@ Grafana consolidates all Graphite metrics so that Graphite doesn't return more d
 By default, Grafana consolidates data points using the `avg` function.
 To control how Graphite consolidates metrics, use the Graphite `consolidateBy()` function.
 
-> **Note:** Legend summary values (max, min, total) can't all be correct at the same time because they are calculated client-side by Grafana.
-> Depending on your consolidation function, only one or two can be correct at the same time.
+{{% admonition type="note" %}}
+Legend summary values (max, min, total) can't all be correct at the same time because they are calculated client-side by Grafana.
+Depending on your consolidation function, only one or two can be correct at the same time.
+{{% /admonition %}}
 
 ### Combine time series
 
@@ -82,8 +84,10 @@ To select data, use the `seriesByTag` function, which takes tag expressions (`=`
 
 The Grafana query builder does this for you automatically when you select a tag.
 
-> **Tip:** The regular expression search can be slow on high-cardinality tags, so try to use other tags to reduce the scope first.
-> To help reduce the results, start by filtering on a particular name or namespace.
+{{% admonition type="note" %}}
+The regular expression search can be slow on high-cardinality tags, so try to use other tags to reduce the scope first.
+To help reduce the results, start by filtering on a particular name or namespace.
+{{% /admonition %}}
 
 ## Nest queries
 

docs/sources/datasources/graphite/template-variables/index.md

@@ -104,7 +104,9 @@ For example, `apps.$app.servers.*` uses the variable `$app` in its query definit
 
 ### Use `__searchFilter` to filter query variable results
 
-> **Note:** Available in Grafana v6.5 and higher.
+{{% admonition type="note" %}}
+Available in Grafana v6.5 and higher.
+{{% /admonition %}}
 
 You can use `__searchFilter` in the query field to filter the query result based on what the user types in the dropdown select box.
 The default value for `__searchFilter` is `*` if you've not entered anything, and `` when used as part of a regular expression.