Fix br html in the observability appendix

[beeme1mr]

Fixes the br element so it doesn't break the doc build.

open-feature/openfeature.dev#1323

[gemini-code-assist]

Summary of Changes

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This pull request addresses a critical documentation build failure by standardizing the HTML line break tag usage within the observability appendix. The change ensures that the documentation compiles without errors by replacing non-standard </br> tags with the correct self-closing <br /> format, thereby improving the reliability of the documentation generation process.

Highlights

• Documentation Build Fix: Corrected invalid HTML line break tags (</br>) to valid self-closing tags (<br />) within the specification/appendix-d-observability.md file. This change resolves an issue that was causing the documentation build to fail.

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[gemini-code-assist]

Code Review

This pull request correctly fixes invalid <br> tags in the observability appendix markdown file, which resolves a documentation build issue. I've suggested a further improvement to enhance the readability and semantic structure of the tables by using HTML lists (<ul>/<li>) instead of <br /> tags for items within table cells. This will make the markdown source easier to maintain.