docs(key_manager): remove mention about key manager only supporting symmetric encryption

[scaleway-bot]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 56.21%. Comparing base (5bf53e0) to head (a7caed5).
⚠️ Report is 784 commits behind head on master.

Files with missing lines	Patch %	Lines
...namespaces/key_manager/v1alpha1/key_manager_cli.go	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (5bf53e0) and HEAD (a7caed5). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5bf53e0)	HEAD (a7caed5)
	2	1

Additional details and impacted files

@@ Coverage Diff @@ ## master #4977 +/- ## =========================================== - Coverage 75.45% 56.21% -19.24%  =========================================== Files 202 308 +106 Lines 44323 77909 +33586 =========================================== + Hits 33444 43797 +10353  - Misses 9653 32704 +23051  - Partials 1226 1408 +182 

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