feat(iam): add doc for UpdateUserPassword

[scaleway-bot]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.48780% with 8 lines in your changes missing coverage. Please review.

Project coverage is 70.94%. Comparing base (5bf53e0) to head (4eeb626).
Report is 322 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/namespaces/iam/v1alpha1/iam_cli.go	80.48%	7 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4250      +/-   ##
==========================================
- Coverage   75.45%   70.94%   -4.52%     
==========================================
  Files         202      294      +92     
  Lines       44323    65715   +21392     
==========================================
+ Hits        33444    46621   +13177     
- Misses       9653    17461    +7808     
- Partials     1226     1633     +407     

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