minor #10980 error.html.twig should contain a email value (clemens-tolboom)

This PR was squashed before being merged into the 2.3-dev branch (closes #10980).

Discussion
----------

error.html.twig should contain a email value

When getting an exception on env PROD it would be nice to have an email to report to.

Current code has [email] instead of a value.

I'm not sure how to fix this as the email value should come from exception.html.twig

```html
<div id="logs">
    {% include 'TwigBundle:Exception:logs.html.twig' with { 'logs': logger.logs } only %}
</div>
```

Some hints are welcome.

Commits
-------

030b8c0 error.html.twig should contain a email value

src/Symfony/Bundle/TwigBundle/Resources/views/Exception/error.html.twig

@@ -9,9 +9,8 @@
         <h2>The server returned a "{{ status_code }} {{ status_text }}".</h2>
 
         <div>
-            Something is broken. Please e-mail us at [email] and let us know
-            what you were doing when this error occurred. We will fix it as soon
-            as possible. Sorry for any inconvenience caused.
+            Something is broken. Please let us know what you were doing when this error occurred.
+            We will fix it as soon as possible. Sorry for any inconvenience caused.
         </div>
     </body>
 </html>