[chore] otlpreceiver: README: markdown formatting fix

[dubek]

Description

Small formatting fix (add missing backquote) in README of otlpreceiver.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: dubek / name: Dov Murik (f667cd6)

[bogdandrutu]

Please sign the CLA. I know is just a small comment, but these are the rules.

[codeboten]

Thanks @dubek!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.47%. Comparing base (52e11ec) to head (f667cd6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11291   +/-   ##
=======================================
  Coverage   91.47%   91.47%           
=======================================
  Files         424      424           
  Lines       20206    20206           
=======================================
  Hits        18484    18484           
  Misses       1339     1339           
  Partials      383      383           

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[dubek]

I signed the CLA and rebased the branch.

[dubek]

Added [chore] to PR title to skip changelog workflow in Github Actions.