Typo in help message in topic_main.cc

[adityapande-1995]

Signed-off-by: Aditya aditya050995@gmail.com

🦟 Bug fix

Summary

This PR fixes a minor typo in the help message displayed by the command ign topic.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• 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.

🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸🔸

[codecov]

Codecov Report

Merging #292 (8543586) into ign-transport11 (e02bd8b) will not change coverage.
The diff coverage is n/a.

❗ Current head 8543586 differs from pull request most recent head 8d386a4. Consider uploading reports for the commit 8d386a4 to get more accurate results

@@               Coverage Diff                @@
##           ign-transport11     #292   +/-   ##
================================================
  Coverage            89.06%   89.06%           
================================================
  Files                   51       51           
  Lines                 4772     4772           
================================================
  Hits                  4250     4250           
  Misses                 522      522           

Impacted Files	Coverage Δ
src/cmd/topic_main.cc	96.49% <ø> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e02bd8b...8d386a4. Read the comment docs.