example on `slate-code` is not working properly

[isubasti]

the onKeyDown example on slate-code's doc only return next() inside the ctrlKey check therefore some keys are not handled properly see https://slate-js.slack.com/archives/C1RH7AXSS/p1553824026021400

[brendancarney]

Thanks for the report @isubasti, I'll look into this soon.

[brendancarney]

I'm unable to reproduce this issue. I asked the reporter in slack for a CodeSandbox to reproduce.

[brendancarney]

Ah, just confirmed that this is a documentation issue. The example in the docs doesn't call next() when it should. We probably need an else block for when ctrlKey is not pressed.