fix: address RM review findings for r2.1 rc

[maheshc01]

Summary

Addresses RM review findings from PR #47 (issues #50, #51, #53).

• x-correlator: Added missing response header to GET /regions 200 response
• GET /regions error codes: Removed inapplicable 404, 422, 429 — this endpoint does not identify a device and has no range parameters
• POST description: Corrected to state that applicationProfileId is required
• info.description: Fixed 404 NOT_FOUND → 404 IDENTIFIER_NOT_FOUND; removed "Notes for API publishers" paragraph referencing non-existent GENERIC_400_MISSING_PORT; updated edgeCloudZoneStatus description to reflect removal of unknown; documented edgeCloudZones as ranked array
• EdgeCloudZoneStatus: Removed unknown enum value and default: unknown — providers must always return an explicit status
• EdgeCloudZone: Made edgeCloudRegion and edgeCloudZoneStatus required fields
• EdgeCloudRegion: Updated to neutral description
• edgeCloudZones: Documented as ordered from best to worst suitability
• Example: Added ranked response example using AWS Wavelength zones on Verizon's network (with valid UUIDs — fixes S-212 from validation)

Closes #50
Closes #51
Closes #53

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[maheshc01]

@Kevsy requesting your review and approve so that i can go ahead and create a new snapshot

[Kevsy]

LGTM, all points in #53 appear to have been tackled 👍 (as well as #50 and #51)

[maheshc01]

thank you Kev!