Correct some discrepancies and inconsistencies in widget support docs. #2204
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Doesn't matter how many times you look at something, you'll miss something.
Corrects some inconsistencies in markup for widget support.
Biggest change is marking Window as not supported on iOS, Android, Web and Textual. While the class exists and it's tested (on iOS and Android anyway), it only functionally exists in as much as there's a MainWindow, so it seemed like we should reflect that.
PR Checklist: