Documentation typo

[tapastro]

This PR addresses a typo found in our guide star pipeline data products page.

Checklist for PR authors (skip items if you don't have permissions or they are not applicable)

• [x] added entry in CHANGES.rst within the relevant release section
• [ ] updated or added relevant tests
• [ ] updated relevant documentation
• [ ] added relevant milestone
• [ ] added relevant label(s)
• [ ] ran regression tests, post a link to the Jenkins job below. How to run regression tests on a PR
• [ ] All comments are resolved
• [ ] Make sure the JIRA ticket is resolved properly

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 60.38%. Comparing base (f6c4095) to head (0214f64).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #8700 +/- ## ======================================= Coverage 60.38% 60.38% ======================================= Files 372 372 Lines 38337 38337 ======================================= Hits 23148 23148 Misses 15189 15189 ```

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