docs(icons): structure disclaimer

packages/documentation/docs/icon-library/_icon_code.md

@@ -49,6 +49,10 @@ import Icons from '@site/src/components/Icons';
   <ix-icon name="https://my.example.cdn.address/assets/my-icon.svg"></ix-icon>
 ```
 
+### Internal SVG structure
+
+The provided SVG icons are graphic resources whose code is mostly generated by design applications such as Figma, Sketch or Adobe Illustrator. The tools use different export routines, which can also change over time. We therefore cannot guarantee that the internal structure of an SVG will be preserved after updates – even if the icons remain visually the same.
+
 ## Icon library
 
 <Icons></Icons>