docs: update broken link to attribute-naming

[Oyami-Srk]

Fixes broken link to attribute-naming.md to naming.md which has been renamed and updated in open-telemetry/semantic-conventions#1694

Changes

Update the URL inside doc string of opentelemetry/src/common.rs.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• [N/A] Unit tests added/updated (if applicable)
• [N/A] Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• [N/A] Changes in public API reviewed (if applicable)

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Oyami-Srk / name: Haoxuan (ea17231)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.7%. Comparing base (ef54c16) to head (ea17231).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #3400     +/-   ##
=======================================
- Coverage   82.7%   82.7%   -0.1%     
=======================================
  Files        128     128             
  Lines      24811   24811             
=======================================
- Hits       20525   20522      -3     
- Misses      4286    4289      +3     

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