Add groups frontmatter field to page metadata reference

[mintlify]

Summary

The groups frontmatter field was missing from the canonical page metadata reference on the Pages documentation page, even though it was documented in the authentication and personalization guides. This adds it to the frontmatter reference section so users can discover it alongside other frontmatter properties.

Triggered by a package bump in the client application. A thorough audit of configuration fields confirmed this was the only undocumented gap.

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Note

Low Risk
Low risk documentation-only change that adds a missing frontmatter field reference; no runtime or behavior changes.

Overview
Adds the missing groups frontmatter field to the Pages metadata reference, documenting how to restrict page access by user group and linking to the authentication/group-access setup docs.

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