MAINT:add comment to explain the example as wx only #2020
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The traitsui/examples/tutorials/traitsui_4.0/editors/animated_gif.py will generate a RuntimeError: Importing from wx backend after selecting qt backend!. The cause of this error comes from assert_toolkit_import(["wx"]) in traitsui/traitsui/toolkit.py. Althought removing this line can suppress this problem, this demo is supposed to be wx only, thus I push this PR to add the message. closes #2016
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