[chore] fix changelog TEMPLATE

[songy23]

It should be receiver/otlp instead of otlpreceiver: https://github.com/open-telemetry/opentelemetry-collector/blob/main/.chloggen/config.yaml

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.24%. Comparing base (7258150) to head (8c1aae0).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14161      +/-   ##
==========================================
- Coverage   92.26%   92.24%   -0.02%     
==========================================
  Files         658      658              
  Lines       41184    41184              
==========================================
- Hits        37998    37992       -6     
- Misses       2181     2185       +4     
- Partials     1005     1007       +2     

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