docs(instance): document the IPv6 address of the Metadata API

[scaleway-bot]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.77%. Comparing base (b3fcf9f) to head (be9e2cf).
⚠️ Report is 904 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3629   +/-   ##
=======================================
  Coverage   75.77%   75.77%           
=======================================
  Files         180      180           
  Lines       41084    41084           
=======================================
  Hits        31131    31131           
  Misses       8816     8816           
  Partials     1137     1137           

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