[Doc] Updated template_from_string to use include function

instead of include tag

doc/functions/template_from_string.rst

@@ -8,8 +8,8 @@ The ``template_from_string`` function loads a template from a string:
 
 .. code-block:: jinja
 
-    {% include template_from_string("Hello {{ name }}") %}
+    {{ include(template_from_string("Hello {{ name }}") }}
-    {% include template_from_string(page.template) %}
+    {{ include(template_from_string(page.template)) }}
 
 .. note::
 
@@ -23,7 +23,7 @@ The ``template_from_string`` function loads a template from a string:
 .. note::
 
     Even if you will probably always use the ``template_from_string`` function
-    with the ``include`` tag, you can use it with any tag or function that
+    with the ``include`` function, you can use it with any tag or function that
     takes a template as an argument (like the ``embed`` or ``extends`` tags).
 
 Arguments