Update global anchors documentation

[ethanpalm]

Updated navigation documentation to reflect that global anchors now support relative paths in addition to external URLs. This change aligns the documentation with PR #5756, which added support for global navigation nodes to use relative paths for internal documentation pages.

Files changed

• organize/navigation.mdx - Updated global anchors section to document relative path support
• es/organize/navigation.mdx - Updated Spanish translation with same changes

Generated from fix: support global nodes with relative paths @dks333

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Note

Low Risk
Documentation-only change that updates guidance/examples for navigation.global.anchors; no runtime behavior is modified.

Overview
Updates the Global anchors documentation to reflect that navigation.global.anchors[].href now supports both external URLs and relative paths to internal docs pages.

Replaces the previous restriction that global anchors must be external-only, and updates the JSON example to include an internal link (e.g., /changelog) alongside an external blog link.

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