[OTLP] Update comment

[martincostello]

Changes

The referenced issue isn't fixed in .NET 9 or 10. Update the comment to not reference a specific version.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[Copilot]

Pull request overview

This PR updates a comment in the OTLP exporter project file to remove references to a specific .NET version (.NET 9), since the referenced issue was not fixed in .NET 9 or 10. The comment now refers to a future .NET release generically, making it version-agnostic and more accurate.

• Updated comment to replace "(hopefully .NET 9)" with "in a future release of .NET"
• Improved XML comment formatting and indentation for better readability

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.75%. Comparing base (3202b94) to head (523ae63).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6766      +/-   ##
==========================================
- Coverage   86.76%   86.75%   -0.01%     
==========================================
  Files         262      262              
  Lines       12319    12319              
==========================================
- Hits        10688    10687       -1     
- Misses       1631     1632       +1     

Flag	Coverage Δ
unittests-Project-Experimental	86.59% <ø> (-0.08%)	⬇️
unittests-Project-Stable	86.36% <ø> (-0.28%)	⬇️

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see 2 files with indirect coverage changes