docs: fix function link

[sibbng]

Description

Additional context

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[antfu]

Well this is intentional. As not all the functions are laying under /core/. We have set the redirection on netlify. If it's broken I think we probably need target="_blank" or add logic for handle the redirection in client side SPA.

[sibbng]

add logic for handle the redirection in client side SPA

I looked at vitepress' router code but it seems there is no way to bypass client side routing without adding target="_blank". So, I just added target="_blank" and fixed useScreenSafeArea link.