docs: Update deprecated field in docs (#6456)

Without this, people will rely on deprecated field.
This fixes it by advising to use the new field that was introduced
in 9b8f10d4bb14f0b8b20f843b869a398390e2f746 (PR #6225).

Signed-off-by: Jean-Philippe Evrard <jean-philippe.evrard+rochepub@external.roche.com>

docs/provider/google-secrets-manager.md

@@ -478,7 +478,7 @@ spec:
 
 ### Location and Replication
 
-By default, secrets are automatically replicated across multiple regions. You can specify a single location for your secrets by setting the `replicationLocation` field:
+By default, secrets are automatically replicated across multiple regions. You can specify one or more replication locations for your secrets by setting the `replicationLocations` field:
 
 ```yaml
 apiVersion: external-secrets.io/v1alpha1
@@ -496,7 +496,8 @@ spec:
         apiVersion: kubernetes.external-secrets.io/v1alpha1
         kind: PushSecretMetadata
         spec:
-          replicationLocation: "us-east1"
+          replicationLocations:
+            - "us-east1"
 ```
 
 ### Customer-Managed Encryption Keys (CMEK)