[Commotion-admin] [commotion-docs] Add note about back-to-back directional nodes (#176)

[andygunn]

Just one more quick change - please add the link to WasabiNet's blog post on building DIY shields: http://gowasabi.net/content/importance-shielding

Ben said we can link to it! 

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https://github.com/opentechinstitute/commotion-docs/issues/176#issuecomment-45895863
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