Remove `FinalizationRegistry.prototype.cleanupSome` (#6426)
Remove `FinalizationRegistry.prototype.cleanupSome` (#6426)

This is in light of https://github.com/codehag/proposal-cleanup-some/issues/6. The page has been removed from MDN. More: https://discourse.mozilla.org/t/should-the-finalizationregistry-prototype-cleanupsome-page-be-removed/64309
chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data