Better wording for self-signed certificate (#845)

* Bump release version to 5.0

* Make LICENSE symlink valid again

* Typo fixes

* Better wording for self-signed certificate

Signed-off-by: JenTing Hsiao <jenting.hsiao@suse.com>

* Integrate review suggestion again.

Co-authored-by: Markus Napp <mnapp@suse.com>
Co-authored-by: Stefan Knorr <sknorr@suse.de>
Co-authored-by: nkoranova <nkoranova@suse.com>

adoc/admin-security-certificates.adoc

@@ -801,11 +801,10 @@ You should receive the following files in return:
 [[self_signed_certificate]]
 === Self-signed Server Certificate
 
-[WARNING]
+[NOTE]
 ====
-Do not use self-signed certificates in production environments.
-There is severe risk of Man-in-the-middle attacks.
-Use proper trusted 3rd-party signed certificates.
+In the case that you decide to use self-signed certificates, make sure that the Certificate Authority
+used for signing is configured securely as a trusted Certificate Authority on the clients.
 ====
 
 In some cases you want to create self-signed certificates for testing.