[css-overflow-3] Update issue number

Author: frivoal

css-overflow-3/Overview.bs

@@ -1125,7 +1125,7 @@ Once it is sufficiently stable in this specification,
 			<a lt="min-content inline size">min-content</a> and <a>max-content</a> <a>inline sizes</a>
 			(see [[css-break-3#varying-size-boxes]]).
 
-			Issue(2945): The effect on intrinsic sizing is under discussion.
+			Issue(3214): The effect on intrinsic sizing is under discussion.
 
 			The effect on [=multi-column containers=] is to discard any [=overflow column=].