[css-overflow-3] Remove stray at-risk reference

Author: fantasai

css-overflow-3/Overview.bs

@@ -21,7 +21,6 @@ Abstract: This module contains the features of CSS relating to scrollable overfl
 Ignored Vars: B, P
 Ignored Terms:viewport, flex order, -webkit-box-orient
 At Risk: the 'max-lines' property
-At Risk: application of 'overflow' to [=replaced elements=]
 Status Text:
 	The description of 'overflow' and its longhands is considered
 	significantly more complete and correct than previous working drafts