fix(@opentelemetry/instrumentation-winston): Add extra details about @opentelemetry/winston-transport scenarios

[hectorhdzg]

Which problem is this PR solving?

Fixes #2283

Short description of the changes

Adding extra documentation about scenarios where both winston transport is added and winston instrumentation log sending is enabled.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.42%. Comparing base (dfb2dff) to head (ae04ea9).
Report is 180 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2302      +/-   ##
==========================================
- Coverage   90.97%   90.42%   -0.56%     
==========================================
  Files         146      148       +2     
  Lines        7492     7322     -170     
  Branches     1502     1518      +16     
==========================================
- Hits         6816     6621     -195     
- Misses        676      701      +25     

see 62 files with indirect coverage changes

[pichlermarc]

Thanks 👍