[D1] Adding wording stating Sessions API is required for RR

[Oxyjun]

Summary

Screenshots (optional)

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[github-actions]

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

Pattern	Owners
/src/content/docs/d1/	@elithrar, @rozenmd, @vy-ton, @joshthoward, @oxyjun, @harshil1712, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://ffd58f65.preview.developers.cloudflare.com
Preview Branch URL: https://jun-d1-rr-sessions-wording.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/d1/best-practices/read-replication/	https://jun-d1-rr-sessions-wording.preview.developers.cloudflare.com/d1/best-practices/read-replication/
https://developers.cloudflare.com/d1/worker-api/d1-database/	https://jun-d1-rr-sessions-wording.preview.developers.cloudflare.com/d1/worker-api/d1-database/