Fix remaining NIST Special Publication 811 links.

[iliekturtles]

Resolves #471.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.25%. Comparing base (3e11cb3) to head (72b92ea).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #481   +/-   ##
=======================================
  Coverage   56.25%   56.25%           
=======================================
  Files          10       10           
  Lines         304      304           
=======================================
  Hits          171      171           
  Misses        133      133           

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