Update Configuration.md

[timsnadden]

Fix typo

[codecov-io]

Codecov Report

Merging #597 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #597   +/-   ##
=======================================
  Coverage   96.07%   96.07%           
=======================================
  Files          99       99           
  Lines        1325     1325           
  Branches      271      271           
=======================================
  Hits         1273     1273           
  Misses         50       50           
  Partials        2        2

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[sapegin]

Thanks!