chore(submissions): update anonymous submissions help link DEV-1365

[duvld]

🗒️ Checklist

1. run linter locally
2. update developer docs (API, README, inline, etc.), if any
3. for user-facing doc changes create a Zulip thread at #Support Docs Updates, if any
4. draft PR with a title <type>(<scope>)<!>: <title> DEV-1234
5. assign yourself, tag PR: at least Front end and/or Back end or workflow
6. fill in the template below and delete template comments
7. review thyself: read the diff and repro the preview as written
8. open PR & confirm that CI passes & request reviewers, if needed
9. delete this section before merging

📣 Summary

Update the help link for allowing anonymous submissions

👀 Preview steps

1. ℹ️ have an account and a project
2. deploy the project
3. navigate to 'Forms'
4. 🔴 [on main] notice that the anonymous submissions help link takes you to 'Sharing projects with user-level permissions'
5. 🟢 [on PR] notice the anonymous submissions help link takes you to 'Allowing submissions without authentication'

[pauloamorimbr]

LGTM! ✨