fix: update user documentation about password encryption

Signed-off-by: Kadaffy Talavera <kadtalavera@gmail.com>

docs/user.md

@@ -96,10 +96,11 @@ psql -U postgres -h localhost -p 6432
 
 ## Password encryption
 
-Passwords are encrypted with `md5` hash generation by default. However, it is
-possible to use the more recent `scram-sha-256` method by changing the
-`password_encryption` parameter in the Postgres config. You can define it
-directly from the cluster manifest:
+Passwords are encrypted using the `scram-sha-256` hashing method by default. However, it is possible to use the `md5` method by changing the `password_encryption` parameter in the PostgreSQL configuration.
+
+> **Note:** `md5` authentication is deprecated in PostgreSQL.
+
+You can also define this parameter directly in the cluster manifest:
 
 ```yaml
 apiVersion: "acid.zalan.do/v1"
@@ -1053,7 +1054,7 @@ spec:
     - all
     volumeSource:
       emptyDir: {}
-  sidecars: 
+  sidecars:
   - name: "container-name"
     image: "company/image:tag"
     volumeMounts: