[Twig] [twig reference] add examples to functions (format_file, file_…

reference/twig_reference.rst

@@ -102,6 +102,21 @@ like :ref:`render() <reference-twig-function-render>` and
 
 .. _reference-twig-function-asset:
 
+.. code-block:: html+twig
+
+    {% set myArray = {'a': 'foo', 'b': 'bar'} %}
+
+    <iframe src="{{ render(controller('App\\Controller\\MyController::baz', {'myArray': myArray})) }}"></iframe>
+
+Output:
+
+.. code-block:: html
+
+    <iframe src="<ul>
+        <li>foo</li>
+        <li>bar</li>
+    </ul>"></iframe>
+
 asset
 ~~~~~
 
@@ -157,6 +172,11 @@ csrf_token
 Renders a CSRF token. Use this function if you want :doc:`CSRF protection </security/csrf>`
 in a regular HTML form not managed by the Symfony Form component.
 
+.. code-block:: twig
+
+	{{ csrf_token(intention = 'my_form') }}
+    {# output: generates a variable token #}
+
 is_granted
 ~~~~~~~~~~
 
@@ -532,6 +552,28 @@ Generates an excerpt of a code file around the given ``line`` number. The
 ``srcContext`` argument defines the total number of lines to display around the
 given line number (use ``-1`` to display the whole file).
 
+Let's assume this is the content of a file :
+
+.. code-block:: text
+
+    a
+    b
+    c
+    d
+    e
+
+.. code-block:: twig
+
+    {{ "/path/to/file/file.txt"|file_excerpt(line = 4, srcContext = 1) }}
+    {# output:
+        3.c
+        4.d
+        5.e #}
+
+    {{ "/path/to/file/file.txt"|file_excerpt(line = 1, srcContext = 0) }}
+    {# output:
+        1.a #}
+
 format_file
 ~~~~~~~~~~~
 
@@ -550,6 +592,36 @@ Generates the file path inside an ``<a>`` element. If the path is inside
 the kernel root directory, the kernel root directory path is replaced by
 ``kernel.project_dir`` (showing the full path in a tooltip on hover).
 
+Example 1
+
+.. code-block:: twig
+
+    {{ "path/to/file/file.txt"|format_file(line = 1, text = "my_text") }}
+
+Output:
+
+.. code-block:: html
+
+    <a href="path/to/file/file.txt#L1"
+        title="Click to open this file" class="file_link">my_text at line 1
+    </a>
+
+Example 2
+
+.. code-block:: twig
+
+    {{ "path/to/file/file.txt"|format_file(line = 3) }}
+
+Output:
+
+.. code-block:: html
+
+    <a href="path/to/file/file.txt#L3"
+        title="Click to open this file" class="file_link">
+        <abbr title="path/to/file/file.txt">file.txt</abbr>
+        / at line 3
+    </a>
+
 format_file_from_text
 ~~~~~~~~~~~~~~~~~~~~~