[Feature request] : Disable spell checking

[nbourre]

I know this repo is for the style, but I didn't find the one for the plugin.

So the feature is simply allow the spell checker to be disable in the formatted block.

Thanks!

[armhil]

@nbourre this is not supported in office add-in apis 🙁

[aress31]

Let's hope that they add this feature to their API in the near feature...