[chore] troubleshootings docs fix yaml code highlighting

[povilasv]

Description:

Fix highlighting for traces config in https://github.com/open-telemetry/opentelemetry-collector/blob/main/docs/troubleshooting.md#traces

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.89%. Comparing base (b808e85) to head (7a3cc3e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9659   +/-   ##
=======================================
  Coverage   90.89%   90.89%           
=======================================
  Files         347      347           
  Lines       18324    18324           
=======================================
  Hits        16655    16655           
  Misses       1344     1344           
  Partials      325      325           

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