[FAB-4944] Fix default value in config doc

The latest default value is -1, not 0.

Change-Id: I420e568e43b838898617cb2d23238a85fd955593
Signed-off-by: Baohua Yang <[email protected]>

Author: yeasy

examples/cluster/config/fabric-ca-server-config.yaml

@@ -100,7 +100,7 @@ ca:
 #############################################################################
 registry:
   # Maximum number of times a password/secret can be reused for enrollment
-  # (default: 0, which means there is no limit)
+  # (default: -1, which means there is no limit)
   maxEnrollments: -1
 
   # Contains identity information which is used when LDAP is disabled

examples/cluster/config/fabric-tlsca-server-config.yaml

@@ -100,7 +100,7 @@ ca:
 #############################################################################
 registry:
   # Maximum number of times a password/secret can be reused for enrollment
-  # (default: 0, which means there is no limit)
+  # (default: -1, which means there is no limit)
   maxEnrollments: -1
 
   # Contains identity information which is used when LDAP is disabled