chore: update gutter role description

[akoreman]

Issue #, if available: na

Description of changes: the aria roledescription of the gutter says editor, which can be confusing as it doesn't behave as an editor. Update it to say editor gutter to be more clear.

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Pull Request Checklist:

• No backwards incompatible changes were made to Ace's public interface which is defined through the main typings file (ace.d.ts) and its references:
  • https://github.com/ajaxorg/ace/blob/master/ace.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-modes.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-extensions.d.ts

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.02%. Comparing base (85f01ca) to head (8fe3f81).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5718   +/-   ##
=======================================
  Coverage   87.02%   87.02%           
=======================================
  Files         598      598           
  Lines       43593    43593           
  Branches     7163     7163           
=======================================
  Hits        37936    37936           
  Misses       5657     5657           

Flag	Coverage Δ
unittests	87.02% <100.00%> (ø)

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