docs(iam): remove beta mentions

[scaleway-bot]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.23%. Comparing base (5bf53e0) to head (3b68ab7).
Report is 557 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (5bf53e0) and HEAD (3b68ab7). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5bf53e0)	HEAD (3b68ab7)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4614       +/-   ##
===========================================
- Coverage   75.45%   55.23%   -20.23%     
===========================================
  Files         202      304      +102     
  Lines       44323    69748    +25425     
===========================================
+ Hits        33444    38524     +5080     
- Misses       9653    29827    +20174     
- Partials     1226     1397      +171     

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