[Pharo-dev] [update 3.0] #30194

[Marcus Denker]

30194
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10546 Matrix class comment refers to Array2D which does not exist anymore
        https://pharo.fogbugz.com/f/cases/10546
        
10875 CleanUp in PolyMorph
        https://pharo.fogbugz.com/f/cases/10875

Diff information:
http://smalltalkhub.com/mc/Pharo/Pharo30/main/Polymorph-Widgets-MarcusDenker.836.diff
http://smalltalkhub.com/mc/Pharo/Pharo30/main/Collections-Unordered-MarcusDenker.157.diff