Add `corepack pnpm` and `corepack yarn` to `corepack --help` about corepack HOT 5 OPEN

Can you clarify what's missing today? corepack pnpm install should already do what you expect it to do, no?

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Why do you have enable/disable Corepack based on the project?
If packageManager isn't specified Corepack will use the global version, whatever that is set to.

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I just assumed it doesn't work because corepack --help doesn't mention it. Now this is more of a documentation issue. I will change the issue title

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Can you clarify what's missing today? corepack pnpm install should already do what you expect it to do, no?

Actually, there's one thing that is missing: PATH.

The scripts in package.json will sometimes invoke pnpm or yarn, but since corepack didn't set PATH, they will invoke the wrong versions. I know this because corepack pnpm exec which pnpm doesn't return the right pnpm.

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I think that's something you should bring up to pnpm - in the case of Yarn it isn't a problem because Yarn already adds itself to the PATH, Corepack or not, precisely for this reason.

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