docs(edge_services): add precision on forwarding behavior

[scaleway-bot]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.20%. Comparing base (c8858aa) to head (5b3d36b).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...espaces/edge_services/v1beta1/edge_services_cli.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5445      +/-   ##
==========================================
- Coverage   51.20%   51.20%   -0.01%     
==========================================
  Files         324      324              
  Lines       75624    75626       +2     
==========================================
  Hits        38723    38723              
- Misses      35424    35426       +2     
  Partials     1477     1477              

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