fix the path of kubeedge-web-controller-app.yaml

[RyanZhaoXB]

some file paths in the instructure are incorrect. now fix them.

[kubeedge-bot]

Welcome @RyanZhaoXB! It looks like this is your first PR to kubeedge/examples 🎉

[kubeedge-bot]

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[RyanZhaoXB]

@fisherxu please help to review this pr. thanks.