Remove deprecated rate-limit provider configurations

[emmanuelgautier]

Summary

Removed deprecated configurations about increasing API request frequency for the Cloudflare Terraform provider.

cloudflare/terraform-provider-cloudflare#5496 (comment)

Documentation checklist

• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.

[github-actions]

Hey there, we've marked this pull request as stale because there's no recent activity on it. This label is helps us identify PRs that might need updates (or to be closed out by our team if no longer relevant).

[github-actions]

Hey there, we've closed out this pull request because it's been stale for a while and there's been no additional action on it. If these changes are still relevant, open a new pull request (or flag to us in a GitHub issue).

[emmanuelgautier]

Hello Cloudflare team,

Thanks for the review @dcpena!

It looks like the PR went stale and was auto-closed before it could move forward. The change is still relevant as the doc remains outdated.

Happy to rebase, update the PR to match the current docs, or open a fresh one if that’s preferred. Just let me know what would be most helpful for you.