Update delaware-nation-in-oklahoma.md

[jhimpele]

copyediting

[render[bot]]

Your Render PR Server URL is https://lenape-timetree-dev-pr-221.onrender.com.

Follow its progress at https://dashboard.render.com/static/srv-chrm6tt269v0v4736eug.

[codecov[bot]]

Codecov Report

Merging #221 (0d91adf) into develop (7fa1041) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #221   +/-   ##
========================================
  Coverage    16.62%   16.62%           
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  Files            9        9           
  Lines          722      722           
  Branches       143      143           
========================================
  Hits           120      120           
  Misses         520      520           
  Partials        82       82