docs: clarify host_header values for non-standard ports

[Rohitpr05]

Rollback Plan

Revert this documentation change.

Changes to Security Controls

No changes to security controls.

Description

Clarify the documentation for host_header.values by documenting that regex_values should be used when matching host headers containing a non-standard port (for example, example.com:8443). This helps users understand the correct configuration for this use case.

Relations

Closes #49147

References

N/A

Output from Acceptance Testing

Documentation-only change. No acceptance tests required.

[github-actions]

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