Use relative update webhook broken link

[lsqproduction]

Summary

• update Update Webhook references to use the internal docs path instead of the full alchemy.com URL
• ensure Address Activity, NFT Activity, and Custom Webhooks tables all point at the same relative endpoint link

Testing

• not run (not requested)

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Codex Task

[github-actions]

🌿 Documentation Preview

Name	Status	Preview	Updated (UTC)
Alchemy Docs	✅ Ready	🔗 Visit Preview	Dec 15, 2025, 11:06 PM

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Restore update webhook link to existing reference page

The new link targets /data/webhooks/webhooks-api-endpoints/notify-api-endpoints/update-webhook, but there is no doc or redirect for this slug anywhere in the repo (find . -path '*notify-api-endpoints*' returns nothing except these three references), so clicking it will 404. The Notify OpenAPI still defines the update-webhook operation under the standard reference endpoints (src/openapi/notify/notify.yaml path /update-webhook), and the other webhook CRUD links in the same table still use /reference/.... This same broken link was also added to the Address Activity and NFT Activity tables.

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