docs: fix typo in 'http/dup' value to use with OTEL_SEMCONV_STABILITY_OPT_IN envvar

[trentm]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.03%. Comparing base (5736c49) to head (a63bc40).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5725   +/-   ##
=======================================
  Coverage   95.03%   95.03%           
=======================================
  Files         310      310           
  Lines        7998     7998           
  Branches     1615     1615           
=======================================
  Hits         7601     7601           
  Misses        397      397           

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