docs(configuration/settings) - updated globalFolder documentation

[vincentmughal11]

What's the problem this PR addresses?

The globalFolder config in the Yarn settings documentation is shown with a value that appears to represent the default, but it's actually just an example. This may lead to confusion, where on platforms like Windows the actual default is different (%LOCALAPPDATA%\Yarn\Berry) - just to make things clear.

Closes #6814

How did you fix it?

Clarified in the documentation that the value shown for globalFolder is only an example and not the acutal platform-specific default.

I updated the Settings (packages/docusaurus/static/configuration/yarnrc.json) documentation file to clarify that the value shown for settings like globalFolder are example values adn not necessarily platform defaults. This helps revent confusion, especially for Windows users, where the default global folder is different than the one shown.

• I edited the respective JSON file in the packages/docusaurus/static/configuration directory
• I followed contribution guidelines and verified the changes using yarn start to preview the updated documentation.

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.