Merge branch 'docs-secret-detection-arch' into 'master'

Document Secret Detection required architecture

See merge request gitlab-org/gitlab!82860

doc/user/application_security/secret_detection/index.md

@@ -42,7 +42,7 @@ To run Secret Detection jobs, by default, you need GitLab Runner with the
 If you're using the shared runners on GitLab.com, this is enabled by default.
 
 WARNING:
-Our Secret Detection jobs expect a Linux container type. Windows containers are not supported.
+Our Secret Detection jobs expect a Linux/amd64 container type. Windows containers are not supported.
 
 WARNING:
 If you use your own runners, make sure the Docker version installed