Wink for GCP users (#33092)

docs/databases/connections/postgresql.md

@@ -104,9 +104,11 @@ The private key must be PKCS8 and stored in DER format.
 If you instead have a PEM SSL client key, you can convert that key to the PKCS-8/DER format using [openssl](https://www.openssl.org/). The command would look something like:
 
 ```
-openssl pkcs8 -topk8 -inform PEM -outform DER -in client-key.pem -out client-key.pk8 -nocrypt
+openssl pkcs8 -topk8 -inform PEM -outform DER -in client-key.pem -out client-key.der -nocrypt
 ```
 
+Note: if you're using GCP and you managed to issue client certificates, everything will be given in PEM format, you only need to transform the client-key.pem into a client-key.der for the "SSL Client Key"
+
 ### Unfold JSON Columns
 
 In some databases, Metabase can unfold JSON columns into component fields to yield a table where each JSON key becomes a column. JSON unfolding is on by default, but you can turn off JSON unfolding if performance is slow.