docs: fix break syntax on the observability appendix

[beeme1mr]

Addresses a syntax issues preventing us from update the spec in the docs.

https://github.com/open-feature/openfeature.dev/actions/runs/20343872688/job/58450627300?pr=1323

[gemini-code-assist]

Summary of Changes

Hello @beeme1mr, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on a critical documentation fix within the observability appendix. The change rectifies an incorrect HTML break tag syntax, replacing </br> with the self-closing <br /> tag. This seemingly minor adjustment is essential as the previous syntax was causing build failures, thereby preventing the successful update of the documentation.

Highlights

• Documentation Syntax Fix: Corrected an invalid HTML break tag syntax (</br>) within the specification/appendix-d-observability.md file.
• Build Issue Resolution: This syntax correction addresses a reported issue that was preventing the documentation from being updated, as indicated by a failed GitHub Actions run.

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[gemini-code-assist]

Code Review

This pull request correctly fixes a syntax issue in the observability appendix by replacing an invalid </br> HTML tag with the proper self-closing <br /> tag. This resolves the documentation build failure. While the fix is correct, I've added a suggestion to further improve the readability and semantic structure of the table by using HTML list elements (<ul>/<li>) instead of line break tags.