The types of the arguments (wxCursor vs wxIcon) were inversed. Even though the description correctly said that wxCursor version was used by MSW and wxIcon -- by wxGTK the converse was actually documented. Fix this and also mention OS X. Finally remove the unnecessary and useless destructor documentation. Closes #13856. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70326 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775