fix ref to security-scram-sha-1 ref

Author: kay-kim

source/core/security-x.509.txt

@@ -72,7 +72,7 @@ Member x.509 Certificates
 
 For internal authentication, members of sharded clusters and replica sets
 can use x.509 certificates instead of keyfiles, which use the
-:doc:`/core/security-scram-sha-1` authentication mechanism.
+:doc:`/core/security-scram` authentication mechanism.
 
 Member Certificate Requirements
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~