[D1] Correct preview database binding docs

[FlorentCollin]

Summary

Corrects the preview_database_id binding reference: it is optional for remote development and falls back to database_id when omitted.

This has come up in one of the D1 escalation ticket and caused some confusion. The field is not required but highly recommended when using wrangler dev --remote https://github.com/cloudflare/workers-sdk/blob/ed666a14156b5600acc11fdc3e1cfec0b0d9f6df/packages/wrangler/src/dev.ts#L508-L527

Documentation checklist

• The change adheres to the documentation style guide.

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/workers/wrangler/	@cloudflare/wrangler, @irvinebroque, @cloudflare/product-owners, @MattieTK, @vy-ton

[github-actions]

Preview URL: https://c67082f8.preview.developers.cloudflare.com
Preview Branch URL: https://fcollin-docs-update-d1-preview-database-id.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/workers/wrangler/configuration/	https://fcollin-docs-update-d1-preview-database-id.preview.developers.cloudflare.com/workers/wrangler/configuration/

[cloudflare-docs-bot]

Review

✅ No issues found in commit c67082f.

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