fixed a code block in the python interfaces tutorial

[mplemay]

Summary

Fixed a minor error in the python tutorial.

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.

[azeey]

Thanks for the contribution! Mind signing off on your commit per https://gazebosim.org/docs/all/contributing#contributing-code?

[mplemay]

Thanks for the contribution! Mind signing off on your commit per https://gazebosim.org/docs/all/contributing#contributing-code?

Done

[codecov]

Codecov Report

Merging #1982 (05edf8a) into gz-sim7 (5d359c6) will increase coverage by 0.12%.
The diff coverage is n/a.

❗ Current head 05edf8a differs from pull request most recent head 92ae9ce. Consider uploading reports for the commit 92ae9ce to get more accurate results

@@             Coverage Diff             @@
##           gz-sim7    #1982      +/-   ##
===========================================
+ Coverage    64.88%   65.01%   +0.12%     
===========================================
  Files          352      352              
  Lines        28429    28429              
===========================================
+ Hits         18447    18483      +36     
+ Misses        9982     9946      -36     

see 4 files with indirect coverage changes