fix: correction to the set resolution docs

[darren-dooley]

What's the problem this PR addresses?

The example in the set resolution docs does not work for many packages.
https://yarnpkg.com/cli/set/resolution#examples

Issues

Resolves #5979

Steps to reproduce:

1. Clone and cd to the yarnpkg/berry repository
2. Run yarn set resolution lodash@npm:^4.17.11 4.16.0
3. Observe the following error

yarn set resolution lodash@npm:^4.17.11 4.16.0
➤ YN0000: · Yarn 4.7.0-dev
➤ YN0000: ┌ Resolution step
➤ YN0001: │ Error: [email protected] isn't supported by any available resolver
    at MultiResolver.getResolverByDescriptor (/Users/***/personal/berry/packages/yarnpkg-core/sources/MultiResolver.ts:73:13)
    at MultiResolver.getResolutionDependencies (/Users/***/personal/berry/packages/yarnpkg-core/sources/MultiResolver.ts:37:27)
    at startDescriptorResolution (/Users/***/personal/berry/packages/yarnpkg-core/sources/Project.ts:911:53)
    at <anonymous> (/Users/***/personal/berry/packages/yarnpkg-core/sources/Project.ts:955:57)
    at async startDescriptorAliasing (/Users/***/personal/berry/packages/yarnpkg-core/sources/Project.ts:896:28)
➤ YN0000: └ Completed
➤ YN0000: · Failed with errors in 0s 154ms

How did you fix it?

The fix is to include npm before the resolved version, 4.16.0 -> npm:4.16.0.
The full command will be yarn set resolution lodash@npm:^4.17.11 npm:4.16.0.

Result

Yarn correctly set the resolution in the yarn.lock file as follows:

"lodash@npm:^4.17.11":
  version: 4.16.0
  resolution: "lodash@npm:4.16.0"
  checksum: 10/37d70b8a67edd4f3ef82ba3354de8dc4123ee9eddd84700a69edd3e2e3f8ae8d562162ed5af95d60810c333745c6ded9c8f432d19840387cde071ddcef5c6ec7
  languageName: node
  linkType: hard

Checklist

• I have read the Contributing Guide.

• I have set the packages that need to be released for my changes to be effective.

• I will check that all automated PR checks pass before the PR gets reviewed.

[clemyan]

@yarnpkg/cli also needs a patch because the output of yarn set resolution --help is affected