[Commotion-admin] [commotion-docs] Modify diagram graphics in Types of Wireless Networks (#324)

[Andy Gunn]

https://commotionwireless.net/docs/cck/networking/types-of-wireless-networks/

Diagrams have confusing number and letter indicators. Switch this to all-number.

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Reply to this email directly or view it on GitHub:
https://github.com/opentechinstitute/commotion-docs/issues/324
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