docs(dynamic-form): fix link from js to ts

closes #1136

Author: Foxandxss

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

@@ -20,8 +20,8 @@
     "title": "Dependency Injection",
     "intro": "Techniques for Dependency Injection"
   },
-  
-  "dynamic-forms": {
+
+  "dynamic-form": {
     "title": "Dynamic Form",
     "intro": "Render dynamic forms with NgFormModel"
   },