Fix or remove design-patterns cheat-sheet link

[Bonnev]

The link for UML > design-patterns cheat-sheet (https://www.slideshare.net/hustwj/design-patterns-cheat-sheet) returns the message:

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[questgugou]

very good

[Bonnev]

Well, it's not that good.. 😄

[Bonnev]

Found the same content here: http://cheat-sheets.org/saved-copy/rc008-designpatterns_online.pdf