CompatHelper: bump compat for "Documenter" to "0.25"

[github-actions]

This pull request changes the compat entry for the Documenter package from 0.24 to 0.24, 0.25.

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-commenter]

Codecov Report

Merging #27 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #27   +/-   ##
=======================================
  Coverage   94.14%   94.14%           
=======================================
  Files          14       14           
  Lines         461      461           
=======================================
  Hits          434      434           
  Misses         27       27           

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