docs: correct default globalFolder in docs

[blimmer]

What's the problem this PR addresses?

Currently, the documentation states that the default globalFolder location is ~/.yarn/berry/global. However, based on my testing, this is not accurate.

 docker run -it --entrypoint bash node:20
root@29746f15333c:/# mkdir test-berry
root@29746f15333c:/# cd test-berry/
root@29746f15333c:/test-berry# yarn init -y
yarn init v1.22.19
warning The yes flag has been set. This will automatically answer yes to all questions, which may have security implications.
success Saved package.json
Done in 0.02s.
root@29746f15333c:/test-berry# cat package.json
{
  "name": "test-berry",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT"
}
root@29746f15333c:/test-berry# yarn set version berry
➤ YN0000: Retrieving https://repo.yarnpkg.com/4.0.2/packages/yarnpkg-cli/bin/yarn.js
➤ YN0000: Saving the new release in .yarn/releases/yarn-4.0.2.cjs
➤ YN0000: Done in 0s 322ms
root@29746f15333c:/test-berry# corepack enable
root@29746f15333c:/test-berry# yarn --version
4.0.2
root@29746f15333c:/test-berry# echo 'enableGlobalCache: true' > .yarnrc.yml
root@29746f15333c:/test-berry# yarn add semver
➤ YN0000: · Yarn 4.0.2
➤ YN0000: ┌ Resolution step
➤ YN0085: │ + semver@npm:7.5.4, lru-cache@npm:6.0.0, yallist@npm:4.0.0
➤ YN0000: └ Completed in 0s 342ms
➤ YN0000: ┌ Fetch step
➤ YN0013: │ 3 packages were added to the project (+ 130.97 KiB).
➤ YN0000: └ Completed
➤ YN0000: ┌ Link step
➤ YN0000: └ Completed
➤ YN0000: · Done in 0s 516ms
root@29746f15333c:/test-berry# ls ~/.yarn/berry/
cache  index  metadata	telemetry.json
root@29746f15333c:/test-berry# ls ~/.yarn/berry/cache/
lru-cache-npm-6.0.0-b4c8668fe1-10c0.zip  yallist-npm-4.0.0-b493d9e907-10c0.zip
semver-npm-7.5.4-c4ad957fcd-10c0.zip

As you can see, the globalFolder appears to be ~/.yarn/berry, not ~/.yarn/berry/global. This also appears to be true in code:

berry/packages/yarnpkg-core/sources/folderUtils.ts

Line 15 in db6210f

return ppath.resolve(getHomeFolder(), `.yarn/berry`);

How did you fix it?

I updated the documentation to reference the correct default globalPath.

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.

[arcanis]

It's not the default value, it's an example value. No harm in updating it, though 👍