Update index.rst

Author: ThomasLandauer

src/Icons/doc/index.rst

@@ -532,7 +532,7 @@ returning the HTML output.
 
 .. warning::
 
-    The ``<twig:ux:icon>`` tag does not support embedded content.
+    The ``<twig:ux:icon>`` component does not support embedded content.
 
     .. code-block:: html+twig