docs: spelling correction for "targetting"

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[codecov[bot]]

Codecov Report

Merging #232 (fbdeed7) into master (b44c487) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #232   +/-   ##
=======================================
  Coverage   79.64%   79.64%           
=======================================
  Files           3        3           
  Lines         113      113           
  Branches       13       13           
=======================================
  Hits           90       90           
  Misses         23       23           

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