Update certbot.rst

[createyourpersonalaccount]

Remove typo that prevents Certbot from working correctly.

Proposed changes

Remove the / at the end of the uri, it's a bug.

Checklist

• I have read the contributing guidelines.
• I have signed the F5 Contributor License Agreement (CLA).
• If applicable, I have added tests that prove my fix is effective or that my feature works.
• If applicable, I have checked that any relevant tests pass after adding my changes.
• I have updated any relevant documentation (README.md and/or CHANGELOG.md).

[createyourpersonalaccount]

How do you sign the F5 CLA?