Document [network_quorum]

rippled-example.cfg

@@ -143,6 +143,11 @@
 #
 #   As a client, supply this to the server in the request object.
 #
+# [validation_quorum]:
+#   Sets the minimum number of trusted validations a ledger must have before
+#   the server considers it fully validated. Note that if you are validating,
+#   your validation counts.
+#
 # [websocket_public_ip]:
 #   IP address or domain to bind to allow untrusted connections from clients.
 #   In the future, this option will go away and the peer_ip will accept