Remove duplicate @doc

[samhstn]

Fixes #14

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@9895e54). Click here to learn what that means.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             master       #15   +/-   ##
==========================================
  Coverage          ?   100.00%           
==========================================
  Files             ?         1           
  Lines             ?        39           
  Branches          ?         0           
==========================================
  Hits              ?        39           
  Misses            ?         0           
  Partials          ?         0           

Impacted Files	Coverage Δ
lib/rbac.ex	100.00% <100.00%> (ø)

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[nelsonic]

@samhstn thanks for updating. 👍