Doc Update: fixed unescaped angle brackets in code snippets.

Change-Id: Ie265dd58fb3a5fcffe955992dea7a1f9417a27d7

docs/html/training/volley/request.jd

@@ -85,7 +85,7 @@ mImageView = (ImageView) findViewById(R.id.myImage);
 
 // Retrieves an image specified by the URL, displays it in the UI.
 ImageRequest request = new ImageRequest(url,
-    new Response.Listener<Bitmap>() {
+    new Response.Listener&lt;Bitmap&gt;() {
         &#64;Override
         public void onResponse(Bitmap bitmap) {
             mImageView.setImageBitmap(bitmap);
@@ -257,7 +257,7 @@ mTxtDisplay = (TextView) findViewById(R.id.txtDisplay);
 String url = "http://my-json-feed";
 
 JsonObjectRequest jsObjRequest = new JsonObjectRequest
-        (Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
+        (Request.Method.GET, url, null, new Response.Listener&lt;JSONObject&gt;() {
 
     &#64;Override
     public void onResponse(JSONObject response) {

docs/html/training/volley/simple.jd

@@ -63,7 +63,7 @@ String url ="http://www.google.com";
 
 // Request a string response from the provided URL.
 StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
-            new Response.Listener<String>() {
+            new Response.Listener&lt;String&gt;() {
     &#64;Override
     public void onResponse(String response) {
         // Display the first 500 characters of the response string.