Fix broken links in terminology tutorial (Garden)

[mabelzhang]

🦟 Bug fix

Fix broken links in tutorial rendered here https://gazebosim.org/api/sim/7/terminology.html

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.

[codecov]

Codecov Report

Merging #2108 (e1ef4b2) into gz-sim7 (b3731d6) will decrease coverage by 0.03%.
The diff coverage is n/a.

❗ Current head e1ef4b2 differs from pull request most recent head 09c41dc. Consider uploading reports for the commit 09c41dc to get more accurate results

@@             Coverage Diff             @@
##           gz-sim7    #2108      +/-   ##
===========================================
- Coverage    65.00%   64.98%   -0.03%     
===========================================
  Files          356      356              
  Lines        28929    28929              
===========================================
- Hits         18806    18800       -6     
- Misses       10123    10129       +6     

see 1 file with indirect coverage changes