docs: pnpm link --global

[cunzaizhuyi]

What is it?

• Feature / enhancement
• Bug
• Docs / tests

Description

My test project use npm, but npm link @builder.io/qwik @builder.io/qwik-city still doesn't work, because the test project can't find the exact path in finder of qwik dist dir after pnpm link.dist.
So we should provide another command pnpm link --global @builder.io/qwik @builder.io/qwik-city .

Use cases and why

Checklist:

• My code follows the developer guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• Added new tests to cover the fix / functionality

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[manucorporat]

Thank you so much!