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 0.27 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.

[github-actions]

Pull Request Test Coverage Report for Build 6203949626

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.07%) to 81.388%

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Totals
Change from base Build 6128171735:	0.07%
Covered Lines:	2427
Relevant Lines:	2982

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💛 - Coveralls

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (ffe9272) 81.32% compared to head (18b822e) 81.51%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #535      +/-   ##
==========================================
+ Coverage   81.32%   81.51%   +0.19%     
==========================================
  Files          25       25              
  Lines        2982     3003      +21     
==========================================
+ Hits         2425     2448      +23     
+ Misses        557      555       -2     

see 3 files with indirect coverage changes

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