Fixed JSON/JSONP examples (#1765)

This corrects my previous mistake where I forgot to adjust the example of JSON after changing the implementation of JSONP.

Author: RunDevelopment

examples/prism-json.html

@@ -14,6 +14,3 @@ <h2>Full example</h2>
     "error": null,
     "status": "Ok"
 }</code></pre>
-
-<h2>JSONP</h2>
-<pre><code>callback({ "data": null });</code></pre>

examples/prism-jsonp.html

@@ -0,0 +1,2 @@
+<h2>Callbacks</h2>
+<pre><code>callback({ "data": null });</code></pre>