rename paddle to PaddlePaddle

index.html

@@ -256,7 +256,7 @@
             <div class="col-lg-8 col-lg-offset-2 text-center">
                 <h2 class="section-heading">Let's Get In Touch!</h2>
                 <hr class="primary">
-                <p>Is there any problems to use paddle, please contact paddle-dev@baidu.com</p>
+                <p>Is there any problems to use PaddlePaddle, please contact paddle-dev@baidu.com</p>
 	    </div>
 	</div>
     </div>