chore(docs): add support for language specific notes

[avodovnik]

This PR lets us define notes in markdown, that are language specific, for example:

Contains the request's resource type as it was perceived by the rendering engine. ResourceType will be one of the
following: `document`, `stylesheet`, `image`, `media`, `font`, `script`, `texttrack`, `xhr`, `fetch`, `eventsource`,
`websocket`, `manifest`, `other`.

:::note csharp
The resource types are available as constants in [ResourceTypes].
:::

which would mean we can include small information nuggets like here more easily without having to override the entire comment.