Document importing SVG images with text

- Mention editor plugins and custom node icons should use the appropriate
  import options.

tutorials/plugins/editor/making_plugins.rst

@@ -211,6 +211,14 @@ don't have one, you can grab the default one from the engine and save it in your
 `addons/my_custom_node` folder as `icon.png`, or use the default Godot logo
 (`preload("res://icon.svg")`).
 
+.. tip::
+
+    SVG images that are used as custom node icons should have the
+    **Editor > Scale With Editor Scale** and **Editor > Convert Icons With Editor Theme**
+    :ref:`import options <doc_importing_images_editor_import_options>` enabled. This allows
+    icons to follow the editor's scale and theming settings if the icons are designed with
+    the same color palette as Godot's own icons.
+
 .. image:: img/making_plugins-custom_node_icon.png
 
 Now, we need to add it as a custom type so it shows on the **Create New Node**