Update docs for secret key config

[r38y]

Here is the document update for signed requests referenced in #72

[coveralls]

Coverage remained the same when pulling 9f80eaa on r38y:secret-key-docs into 2ceb5ba on Ink:master.

[maurogeorge]

Thanks a lot @r38y ⭐

[r38y]

Sure thing! The wording may be a little awkward but it gets the job done.

On Mon, Dec 9, 2013 at 3:21 PM, Mauro George notifications@github.comwrote:

Thanks a lot @r38y https://github.com/r38y [image: ⭐]

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Randy Schmidt