Show documentation in completer on mouse over

[krassowski]

mouse over the elements should automatically update the docs on the right (like when using arrow keys)

See video for examples - https://streamable.com/kro69o

Originally posted by @roboserg in https://github.com/krassowski/jupyterlab-lsp/issues/664#issuecomment-898040188

just to make sure, you mean that hovering over the completion suggestions should show the documentation, right? This is an interesting suggestion - thanks!

_Originally posted by @krassowski

Yes [...]

[roboserg]

Thank you :)