[Doc] Revert some wrong changes in Twig Component docs

Author: javiereguiluz

src/TwigComponent/doc/index.rst

@@ -365,21 +365,6 @@ You can even give the block default content. See
 :ref:`Passing HTML to Components via Block <embedded-components>`
 for more info.
 
-The only limitation when defining contents inside a component using the HTML syntax
-is that you cannot import macros using the ``_self`` keyword. You must always use
-the full template path:
-
-.. code-block:: html+twig
-
-    <twig:Alert>
-        {# ❌ this won't work #}
-        {% from _self import message_formatter %}
-        {# ✅ this works as expected #}
-        {% from 'some/path/template.html.twig' import message_formatter %}
-
-        {{ message_formatter('...') }}
-    </twig:Alert>
-
 Fetching Services
 -----------------