Fix mkdocstrings inventory example in documentation

[pawamoy]

Change Summary

Fix a documentation error about loading object inventories with mkdocstrings.

Related issue number

#11289, #11291

Checklist

• The pull request title is a good summary of the changes - it will be used in the changelog
• Unit tests for the changes exist
• Tests pass on CI
• Documentation reflects the changes where applicable
• My PR is ready to review, please add a comment including the phrase "please review" to assign reviewers

Please review!

[codspeed-hq]

CodSpeed Performance Report

Merging #11311 will not alter performance

_{Comparing pawamoy:patch-1 (08f436d) with main (a3fd33f)}

Summary

✅ 45 untouched benchmarks

[github-actions]

Coverage report

This PR does not seem to contain any modification to coverable code.

[Viicos]

Thanks, that was hard to get right 😅