Fix spelling of OpenTelemetry in readme

[alanwest]

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[codecov]

Codecov Report

Merging #698 (14b3fa2) into main (e728c53) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #698   +/-   ##
=========================================
  Coverage     83.82%   83.82%           
  Complexity     1233     1233           
=========================================
  Files           138      138           
  Lines          2980     2980           
=========================================
  Hits           2498     2498           
  Misses          482      482           

Flag	Coverage Δ
7.4	83.82% <ø> (ø)
8.0	83.87% <ø> (ø)
8.1	83.87% <ø> (ø)

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[tidal]

Thank you @alanwest !