[Commotion-admin] [commotion-docs] Update "Wireless Challenges" (#326)

[Andy Gunn]

[Wireless Challenges](https://commotionwireless.net/docs/cck/networking/wireless-challenges/) needs an update, based on feedback from workshop participants. Update presentation, and worksheets.

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Reply to this email directly or view it on GitHub:
https://github.com/opentechinstitute/commotion-docs/issues/326
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