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)

• 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]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

Additional details and impacted files

@@           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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[melanieclarke]

LGTM! I'll take your word for it that it's the right value now.