CLI flag `--experimental-modules`

[coreyfarrell]

I just ran node --help on v14.0.0-rc.3, I was surprised to see that --experimental-modules was still listed. I understand why this flag is still tolerated by the CLI but should it be be hidden from the help listing as it no longer needs to be specified?

[MylesBorins]

@coreyfarrell I opened a PR to fix this

[aduh95]

I think the fix has landed in 14.1.0, should this stay open?