Fixed the ESI render example code to work with symfony 2.1

[paran01d]

Q	A
Doc fix?	yes
New docs?	no
Applies to	2.1
Fixed tickets	#2303

First time doing this so I hope its ok.

[lyrixx]

AFAIR, the render, function exists in symfony 2.1. since the function is more flexible than the tag, we should to only document the function

[paran01d]

can you provide an example of using the render function (i know nothing about it) and ill happily update.

[lyrixx]

For 2.2 it is:
{{ render_esi(url('BlogBundle:Post:list', { 'limit': 2 }), { 'alt': 'BlogBundle:Post:error'}) }}.

I'm not sure, but i Think for 2.1 it is:
{{ render(url('BlogBundle:Post:list', { 'limit': 2 }), { 'alt': 'BlogBundle:Post:error', 'standalone' : true}) }}

[stof]

@lyrixx The render function is new in 2.2. 2.1 only supports the tag: https://github.com/symfony/symfony/blob/2.1/src/Symfony/Bundle/TwigBundle/Extension/ActionsExtension.php

[paran01d]

and 2.1 also seems to require with {} part or it causes a syntax error from twig.

[stof]

@paran01d indeed. The current PR is right. the change suugested by @lyrixx is not

[lyrixx]

Sorry. :(

[weaverryan]

Thanks everyone! I fixed one other instance I found at sha: 6658c97

@paran01d This was a perfect PR and contribution - especially great for your first time!