CompatHelper: bump compat for Documenter to 1 for package docs, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Documenter package from 0.25 to 0.25, 1 for package docs.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.84%. Comparing base (eb820eb) to head (bf535d4).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #43   +/-   ##
=======================================
  Coverage   86.84%   86.84%           
=======================================
  Files           1        1           
  Lines          76       76           
=======================================
  Hits           66       66           
  Misses         10       10           

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