comment out empty interfaces

[ignatiusmb]

Following TS approach when generating a tsconfig.json, it starts out with all the options commented out with some brief description besides and above it. Since this is just an interface, having a link that points to the docs that explains everything should be enough. Having some brief descriptions would be redundant with the docs and may lead to out-of-sync details later on.

Fixes #3839

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[ignatiusmb]

Ah @Rich-Harris, I probably should've commented earlier on that additional //. I committed it separately in 9d94d44 because it would collapse itself since it's become an empty namespace, and forcing a space between would fail on lint.