Add comment on RED.nodes.getNodeLinkCount api

packages/node_modules/@node-red/editor-client/src/js/nodes.js

@@ -2717,6 +2717,10 @@ RED.nodes = (function() {
             return [];
         },
         getNodeLinkCount: function(id,portType,index) {
+            // We *could* just let callers use `getNodeLinks` and get the
+            // the length for themselves. However, that function creates
+            // a clone of the array - which is needless work if all you
+            // want is the length
             if (nodeLinks[id]) {
                 if (portType === 1) {
                     return nodeLinks[id].inCount[index] || 0