Update minimum_master_nodes comment to match documentation

Someone on the mailing list wrongly interpreted it to mean the current node is not included in the calculation.

config/elasticsearch.yml

@@ -296,8 +296,8 @@
 # and master node is elected. Multicast discovery is the default.
 
 # Set to ensure a node sees N other master eligible nodes to be considered
-# operational within the cluster. Set this option to a higher value (2-4)
-# for large clusters (>3 nodes):
+# operational within the cluster. Its recommended to set it to a higher value
+# than 1 when running more than 2 nodes in the cluster.
 #
 # discovery.zen.minimum_master_nodes: 1