[w3c/editing] Match browser behaviors of execCommand(bold) (#243)

https://w3c.github.io/editing/ActiveDocuments/execCommand.html#the-bold-command

Currently Blink thinks `font-weight` >= 600 is bold while Gecko thinks >= 500 is bold enough, as the spec currently describes.

The spec somehow determined to follow Blink behavior, but do we really think Blink one is the best here? Does Gecko behavior actually look better? Should Gecko follow Blink or vise versa?

cc @masayuki-nakano

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