docs: Change default refreshInterval to 5m (#3283)

Signed-off-by: Engin Diri <engin.diri@ediri.de>

docs/provider/pulumi.md

@@ -38,7 +38,7 @@ kind: ExternalSecret
 metadata:
   name: secret
 spec:
-  refreshInterval: 20s
+  refreshInterval: 5m
   secretStoreRef:
     kind: SecretStore
     name: secret-store