[Doc] Provide an alternative for the deprecated spaceless filter

doc/filters/spaceless.rst

@@ -3,7 +3,8 @@
 
 .. warning::
 
-    The ``spaceless`` filter is deprecated as of Twig 3.12.
+    The ``spaceless`` filter is deprecated as of Twig 3.12. Instead, use the
+    :ref:`whitespace control features <templates-whitespace-control>`.
 
 Use the ``spaceless`` filter to remove whitespace *between HTML tags*, not
 whitespace within HTML tags or whitespace in plain text:

doc/templates.rst

@@ -934,21 +934,6 @@ the modifiers on one side of a tag or on both sides:
         {{~ value }}    </li>
     {# outputs '<li>\nno spaces    </li>' #}
 
-.. tip::
-
-    In addition to the whitespace modifiers, Twig also has a ``spaceless`` filter
-    that removes whitespace **between HTML tags**:
-
-    .. code-block:: html+twig
-
-        {% apply spaceless %}
-            <div>
-                <strong>foo bar</strong>
-            </div>
-        {% endapply %}
-
-        {# output will be <div><strong>foo bar</strong></div> #}
-
 Extensions
 ----------