Fix Documentation Rendering on Usage and ItemSearch pages

[omad]

Description:

Fix a couple of tiny syntax errors in the documentation which affect the rendering.

PR Checklist:
I've built the documentation locally, the changes work.

I don't think these items are required:

• Code is formatted
• Tests pass
• Changes are added to CHANGELOG.md

[gadomski]

Thanks for this!

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.92%. Comparing base (21435b0) to head (09c120d).
⚠️ Report is 128 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #815      +/-   ##
==========================================
+ Coverage   93.43%   93.92%   +0.48%     
==========================================
  Files          13       15       +2     
  Lines         990     1234     +244     
==========================================
+ Hits          925     1159     +234     
- Misses         65       75      +10     

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