feat(ui): flash message keys added

As the FlashBah can store multiples message keys, it could be a good idea to indicate that we can use the different keys.
symfony · javiereguiluz · Feb 15, 2019 · Feb 11, 2019 · Feb 11, 2019 · 9516b1558dda3450d3e33de94e1c486b48f368ed
commit 9516b1558dda3450d3e33de94e1c486b48f368ed
diff --git a/controller.rst b/controller.rst
@@ -546,7 +546,16 @@ read any flash messages from the session using ``app.flashes()``:
        </div>
    {% endfor %}

-    {# ...or you can read and display every flash message available #}
+    {# ...or you can read and display every flash message available for given labels #}
+    {% for label, messages in app.flashes(['success', 'warning']) %}
+        {% for message in messages %}
+            <div class="flash-{{ label }}">
+                {{ message }}
+            </div>
+        {% endfor %}
+    {% endfor %}
+
+    {# ...finally you can read and display every flash message available #}
    {% for label, messages in app.flashes %}
        {% for message in messages %}
            <div class="flash-{{ label }}">