Remove duplicated string in Documentation

[mklauber]

What this PR does / why we need it

Fixes a duplicated header in the documentation.

Checklist

Complete these before marking the PR as ready to review:

• DCO signed
• The PR title has a summary of the changes
• The PR body has a summary to reflect any significant (and particularly user-facing) changes introduced by this PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.37%. Comparing base (f58e6bf) to head (049c380).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #326   +/-   ##
=======================================
  Coverage   84.37%   84.37%           
=======================================
  Files          50       50           
  Lines        2445     2445           
=======================================
  Hits         2063     2063           
  Misses        251      251           
  Partials      131      131           

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[jkroepke]

Thanks!