fix typo in help message

[JasonFengGit]

Pull Request

Description

Found a typo when investigating gap between 5 and 15 mins satellite

How Has This Been Tested?

This should not affect any code logics

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] I have performed a self-review of my own code
• [x] I have checked my code and corrected any misspellings