Document bug for node certtificate.

Author: Michael Burke

security/certificate_types_descriptions/node-certificates.adoc

@@ -20,7 +20,7 @@ These certificates are managed by the system and not the user.
 
 == Expiration
 
-Node certificates are automatically rotated after 292 days and expire after 365 days.
+Node certificates are automatically rotated after 30 days.
 
 == Renewal