docs(kv): add jurisdiction sample code to data-location page

[rts-rob]

The KV jurisdiction private beta is now in customer hands (originally rolled out with Webflow), but the data-location page describes the feature without showing how to create a jurisdiction-restricted namespace. This PR adds Wrangler and REST API samples for creating a namespace with --jurisdiction=eu, mirroring the pattern used on the D1 data-location page. Change is purely additive — two new subsections inserted between ### Supported jurisdictions and ### Get access; no other line of the file was touched. No dashboard subsection since KV jurisdictions remain private-beta / account-team-enrolled.

[cloudflare-docs-bot]

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