4.0: LSP server does not use the new documentation comment format

[atirut-w]

Godot version

v4.0.beta1.official [20d6672]

System information

N/A

Issue description

Godot's LSP server still uses the old method of apparently sending comments verbatim to the client as hover docs, so new doc comments using double hashes are now headers.

I am using the official Godot extension for VSCode.

Steps to reproduce

1. Create a new project and a script using Godot 4 Beta 1
2. Open the script using VSCode. Note: set up the extension the same way as 3.x but change LSP port to 6005 in VSCode settings.
3. Create a variable or a function and add a doc comment
4. Very big documentations on hover.

Minimal reproduction project

No response