CompatHelper: add new compat entry for Documenter at version 0.27 for package docs, (keep existing compat)

[github-actions[bot]]

This pull request sets the compat entry for the Documenter package to 0.27 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. Note: Consider registering a new release of your package immediately after merging this PR, as downstream packages may depend on this for tests to pass.

[codecov[bot]]

Codecov Report

Merging #51 (0e5c938) into master (f0690a8) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #51   +/-   ##
=======================================
  Coverage   95.91%   95.91%           
=======================================
  Files           1        1           
  Lines          98       98           
=======================================
  Hits           94       94           
  Misses          4        4           

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