docs(secret_manager): update documentation about key_id

[scaleway-bot]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.27%. Comparing base (5bf53e0) to head (acf56ec).
Report is 597 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (5bf53e0) and HEAD (acf56ec). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5bf53e0)	HEAD (acf56ec)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4678       +/-   ##
===========================================
- Coverage   75.45%   55.27%   -20.19%     
===========================================
  Files         202      310      +108     
  Lines       44323    79063    +34740     
===========================================
+ Hits        33444    43700    +10256     
- Misses       9653    33961    +24308     
- Partials     1226     1402      +176     

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