[graphiql] Don't render newlines in documentation strings

[leonardehrenfried]

Long documentation strings that contain a newline are rendered as is in GraphiQL. This makes reading them a bit confusing and disjointed.

Doc pane

Tooltip

In the original schema this looks like this:

    """
    Bearing, in degrees, clockwise from North, i.e., 0 is North and 90 is East. This can be the
    compass bearing, or the direction towards the next stop or intermediate location.
    """
    heading: Float

I would love it if these doc strings, which in our case can be multiple paragraphs, be treated like markdown. This would mean that a single newline is ignored and a double newline treated as a new paragraph.

Thank you for making this wonderful piece of software.

[acao]

thanks @leonardehrenfried ! this is a great suggestion. packages/graphiql-react/src/markdown.ts is where we keep the configuration for markdown-it, and iirc, this is just a simple config tweak or plugin away from happening!