#146 fix wrong twig syntax urls

3-front-end-development/3.3-twig-syntax.md

@@ -35,7 +35,7 @@ Array items can also be accessed using the subscript syntax (`[]`):
 {{ foo['bar'] }}
 ```
 
-From [Twig for Template Designers](http://twig.sensiolabs.org/doc/2.x/templates.html):
+From [Twig for Template Designers](https://twig.symfony.com/doc/3.x/templates.html:
 > For convenience's sake `foo.bar` does the following things on the PHP layer:
 >
 > - check if `foo` is an array and `bar` a valid element;
@@ -179,7 +179,7 @@ If filtering the tokens inside the {% trans %} block does not work, create a tok
 
 ## Macros
 
-From [Twig's official macro documentation](http://twig.sensiolabs.org/doc/2.x/tags/macro.html):
+From [Twig's official macro documentation](https://twig.symfony.com/doc/3.x/tags/macro.html):
 
 > Macros are comparable with functions in regular programming languages. They are useful to put often used HTML idioms into reusable elements to not repeat yourself.
 
@@ -207,7 +207,7 @@ Here is a small example of a macro that renders a form element:
 - [drupal.org: Filters - Modifying Variables In Twig Templates](https://www.drupal.org/docs/8/theming/twig/filters-modifying-variables-in-twig-templates)
 - [weebpal.com: Drupal 8 Theming Essential Guide](https://www.weebpal.com/blog/drupal-8-theming)
 - [sqndr.github.io: Twig Debug](https://sqndr.github.io/d8-theming-guide/twig/twig-debug.html)
-- [twig.sensiolabs.org: macro](http://twig.sensiolabs.org/doc/2.x/tags/macro.html)
+- [twig.symfony.com: macro](https://twig.symfony.com/doc/3.x/tags/macro.html)
 
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