fusion/matching should also use some and none instead of Some and None:

[ringabout]

Ref https://github.com/nim-lang/Nim/pull/17147#issue-577813481

[haxscramper]

Discussed in https://github.com/timotheecour/Nim/issues/612. Some and None are chosen for similarity with kind prefix drop.

It would be trivial to implement some and none support too, but the intended way of writing would still be Some and None. (i.e. I can add check for "some", but don't want to switch whole documentation to new style). Is that acceptable?