Update triggered_publisher.md

[ahcorde]

🦟 Documentation fix

Fixes gazebosim/gazebo_test_cases#387

Summary

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

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[codecov]

Codecov Report

Merging #2130 (4ec65fc) into gz-sim8 (923ccee) will increase coverage by 0.01%.
The diff coverage is n/a.

❗ Current head 4ec65fc differs from pull request most recent head 1f3e12b. Consider uploading reports for the commit 1f3e12b to get more accurate results

@@             Coverage Diff             @@
##           gz-sim8    #2130      +/-   ##
===========================================
+ Coverage    65.45%   65.47%   +0.01%     
===========================================
  Files          323      323              
  Lines        30704    30704              
===========================================
+ Hits         20097    20102       +5     
+ Misses       10607    10602       -5     

see 2 files with indirect coverage changes

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