TipFormatter: Backtick should be escaped from cref attributes

[MangelMaxime]

The following doc comment

/// See <see cref="T:Fable.Form.Simple.Form.MapValuesConfig`2"/> for more informations

results in:

[baronfel]

This might just go away when the next FCS comes out and we get the XML parsing newly-included in there for free.

[MangelMaxime]

Didn't know that, I though I would jump back into the implementation I contributed of TipFormatter but that's good news if there is a standard parser coming out.

Is there a place where I can read about it? Current implementation of the TipFormatter in FSAC is one of the best existing from what I saw in other IDE.

[baronfel]

There's not documentation yet, but this PR was merged a little bit ago and will be coming in FCS 40.

Essentially it would remove/replace our built-in XML comment reading with a facility that is in FCS now, but the extraction of information that TipFormatter uses to collect into the tooltips would likely remain the same. Just the data structure that the information would be extracted from would change.