how-to's fixed slashes in code comments

apps/tests/camera-tests.ts

@@ -1,13 +1,11 @@
-import camera = require("camera");
-
-// >> camera-require
-// var camera = require("camera");
+// >> camera-require
+import camera = require("camera");
 // << camera-require
 
 export var test_takePicture = function () {
     // >> camera-take-picture
     camera.takePicture().then(result => {
-        //// result is ImageSource
+        // result is ImageSource
     });
     // << camera-take-picture
 };