New reference architecture diagram - Optimizing device roaming experience with geolocated IPs (#18735)

* New reference architecture diagram

* Update src/content/docs/reference-architecture/diagrams/network/optimizing-roaming-experience-with-geolocated-ips.mdx

Co-authored-by: hyperlint-ai[bot] <154288675+hyperlint-ai[bot]@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Claire W <[email protected]>

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Co-authored-by: hyperlint-ai[bot] <154288675+hyperlint-ai[bot]@users.noreply.github.com>
Co-authored-by: Claire W <[email protected]>

Author: 3 people