Billing: correct location of invoice email preferences (Subscriptions tab)

[gords2]

Fixes #31128.

The "Receive invoice emails" steps pointed to the Invoices and documents tab, but the billing email preferences aren't there. Per the issue reporter, they live in a Billing Email card on the Subscriptions tab (Manage Account > Billing).

Updated steps 2–3 of that section to point to the correct location. The Download invoice section below is left unchanged, since downloading invoices is on the Invoices and documents tab.

[cloudflare-docs-bot]

Review

✅ No issues found in commit 3a78bb9.

Code Review

This code review is in beta and may not always be helpful — use your judgment.

✅ No code review issues found.

Style Guide Review

✅ No style-guide issues found.

Commands

Only codeowners can run commands. Post a comment with the command to trigger it.

Command	Description
/review	Runs a review now. Incremental if a prior review exists, full if not.
/full-review	Re-reviews the entire PR diff from scratch, ignoring incremental history. Useful after a rebase, when you want a fresh review, or if the bot gets out of sync and reports issues that no longer exist.
/ignore-review-limit	Permanently lifts the 2-review automatic limit for this PR. Future pushes will trigger reviews as normal.

[github-actions]

Hey there, we've marked this pull request as stale because there's no recent activity on it. This label 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).