fix: url of tracing env vars

[2color]

Fixes a broken url in the tracing docs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.36%. Comparing base (625aadd) to head (6e5799f).
Report is 3 commits behind head on main.

@@            Coverage Diff             @@
##             main     #719      +/-   ##
==========================================
- Coverage   60.38%   60.36%   -0.02%     
==========================================
  Files         243      243              
  Lines       31021    31021              
==========================================
- Hits        18731    18727       -4     
- Misses      10626    10628       +2     
- Partials     1664     1666       +2     

see 13 files with indirect coverage changes

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