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

[github-actions[bot]]

This pull request changes the compat entry for the Documenter package from 0.27 to 0.27, 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[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (d7c549f) 97.37% compared to head (a74f204) 97.37%.

:exclamation: Current head a74f204 differs from pull request most recent head eaed27d. Consider uploading reports for the commit eaed27d to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #127 +/- ## ======================================= Coverage 97.37% 97.37% ======================================= Files 8 8 Lines 305 305 ======================================= Hits 297 297 Misses 8 8 ```

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