Refine comment text and MIT license url

NOTICE.txt

@@ -286,7 +286,7 @@ This product includes code in the function applyCubicBezierStyles that was
 inspired by a public Codepen, which was available under a "MIT" license.
 
 Copyright (c) 2020 by Guillaume (https://codepen.io/guillaumethomas/pen/xxbbBKO)
-MIT License http://www.opensource.org/licenses/mit-license.php
+MIT License http://www.opensource.org/licenses/mit-license
 
 ---
 This product includes code that is adapted from mapbox-gl-js, which is

x-pack/plugins/apm/public/components/app/ServiceMap/Cytoscape.tsx

@@ -80,7 +80,7 @@ function getLayoutOptions(nodeHeight: number): cytoscape.LayoutOptions {
  * inspired by a public Codepen, which was available under a "MIT" license.
  *
  * Copyright (c) 2020 by Guillaume (https://codepen.io/guillaumethomas/pen/xxbbBKO)
- * MIT License http://www.opensource.org/licenses/mit-license.php
+ * MIT License http://www.opensource.org/licenses/mit-license
  */
 function applyCubicBezierStyles(edges: cytoscape.EdgeCollection) {
   edges.forEach((edge) => {
@@ -92,7 +92,7 @@ function applyCubicBezierStyles(edges: cytoscape.EdgeCollection) {
     const costheta = z === 0 ? 0 : x / z;
     const alpha = 0.25;
     // Two values for control-point-distances represent a pair symmetric quadratic
-    // bezier curves joined to appear as a single cubic bezier curve:
+    // bezier curves joined in the middle as a seamless cubic bezier curve:
     edge.style('control-point-distances', [
       -alpha * y * costheta,
       alpha * y * costheta,