docs(edge_services): update description for billing endpoint

[scaleway-bot]

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[changeset-bot]

⚠️ No Changeset found

Latest commit: 282841b

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.06%. Comparing base (c80a70f) to head (282841b).
Report is 409 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1683      +/-   ##
==========================================
- Coverage   94.01%   93.06%   -0.96%     
==========================================
  Files          53       92      +39     
  Lines        3427     5062    +1635     
  Branches      476      960     +484     
==========================================
+ Hits         3222     4711    +1489     
- Misses        205      351     +146     

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