Fix issue where organizeDeclarations rule would unexpectedly remove non-mark comment

[calda]

This PR fixes an issue I noticed where the organizeDeclarations rule would unexpectedly remove a non-mark comment.

In this case, the comment is within the edit distance threshold of a comment like // Static Properties, meaning it would be unexpectedly removed:

        enum Test {
-           /// Test Properties
            static let foo = "foo"
            static let bar = "bar"
            static let baaz = "baaz"
        }

Instead it seems better to only look for and remove MARK comments.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.43%. Comparing base (6db7324) to head (49497db).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1956      +/-   ##
===========================================
- Coverage    95.44%   95.43%   -0.01%     
===========================================
  Files          138      138              
  Lines        24939    24953      +14     
===========================================
+ Hits         23803    23815      +12     
- Misses        1136     1138       +2     

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