Correcting a typo

What does this MR do?

Corrects a typo in the README.md in the section to reset the registration token.

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

The acceptance criteria may not be applicable as the change is too small

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides