[Commotion-admin] [commotion-docs] Document Commotion-Router target selection (#43)

[areynold]

Target selection (e.g., TP-Link) is implied in Commotion-Router's build instructions, but should be made explicit. Full menuconfig documentation is out of scope, but users should understand how to build alternate images using Commotion defaults.

@andygunn, @areynold

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Reply to this email directly or view it on GitHub:
https://github.com/opentechinstitute/commotion-docs/issues/43
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