[css-ui-4] outline-width may be ignored if outline-style is auto

Closes w3c#4925

Author: frivoal

css-ui-4/Overview.bs

@@ -331,7 +331,8 @@ e.g. a rounded edge outline with semi-translucent outer pixels
 that appears to glow.
 As such, this specification does not define how the
 'outline-color'
-is incorporated or used (if at all) when rendering
+and 'outline-width'
+are incorporated or used (if at all) when rendering
 ''outline-style/auto'' style outlines.
 User agents may treat ''outline-style/auto'' as
 ''outline-style/solid''.