docs(span): enhance Span documentation

[DonIsaac]

Part of oxc-project/backlog#130

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[DonIsaac]

• docs(span): enhance Span documentation #6707 👈
• test(span): add Span::is_empty unit tests #6706
• main

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[codspeed-hq]

CodSpeed Performance Report

Merging #6707 will not alter performance

_{Comparing don/10-20-doc_span_enhance_span_documentation (85d5220) with main (202c7f6)}

Summary

✅ 30 untouched benchmarks

[Boshen]

Merge activity

• Oct 21, 10:30 AM EDT: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Oct 21, 10:30 AM EDT: A user added this pull request to the Graphite merge queue.
• Oct 21, 10:37 AM EDT: A user merged this pull request with the Graphite merge queue.