docs(ts-to-js): ward's edits (incomplete)

Author: wardbell

public/docs/dart/latest/cookbook/_data.json

@@ -60,7 +60,7 @@
 
   "ts-to-js": {
     "title": "TypeScript to JavaScript",
-    "intro": "Convert Angular TypeScript examples into ES5 JavaScript",
+    "intro": "Convert Angular TypeScript examples into ES6 and ES5 JavaScript",
     "hide": true
   },
 

public/docs/js/latest/cookbook/_data.json

@@ -55,7 +55,7 @@
 
   "ts-to-js": {
     "title": "TypeScript to JavaScript",
-    "intro": "Convert Angular TypeScript examples into ES5 JavaScript"
+    "intro": "Convert Angular TypeScript examples into ES6 and ES5 JavaScript"
   },
 
   "visual-studio-2015": {