Fix OTLP GRPC example

[erdemkose]

OTLP GRPC example has a call to an unknown method.

[linux-foundation-easycla]

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• ✅ login: erdemkose / name: Erdem Köse (bcad2a8)

[codecov]

Codecov Report

Merging #856 (141b49a) into main (0b43fac) will not change coverage.
The diff coverage is n/a.

❗ Current head 141b49a differs from pull request most recent head bcad2a8. Consider uploading reports for the commit bcad2a8 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #856   +/-   ##
=========================================
  Coverage     80.80%   80.80%           
  Complexity     1951     1951           
=========================================
  Files           248      248           
  Lines          5122     5122           
=========================================
  Hits           4139     4139           
  Misses          983      983           

Flag	Coverage Δ
7.4	80.29% <ø> (ø)
8.0	80.80% <ø> (ø)
8.1	80.94% <ø> (ø)

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[brettmc]

thanks @erdemkose !