Docs: typo fix dupplicate > duplicate

[coliff]

Short description of what this resolves:

Fixes a couple of typos in CHANGELOG

Proposed changes:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.46%. Comparing base (14bf48c) to head (4eefadb).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1531   +/-   ##
=======================================
  Coverage   98.46%   98.46%           
=======================================
  Files           2        2           
  Lines        1627     1627           
  Branches      342      340    -2     
=======================================
  Hits         1602     1602           
  Misses         25       25           

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