Remove issue about whether continue or discard is the default

Author: andreubotella

css-overflow-4/Overview.bs

@@ -849,9 +849,6 @@ Limiting Visible Lines: the 'line-clamp' shorthand property</h3>
 		<dt><dfn><<integer [1,∞]>></dfn>
 		<dt><dfn><'block-ellipsis'></dfn>
 		<dd>
-
-			Issue(7708): Whether this should imply ''discard'' or ''collapse'' is an unresolved question.
-
 			Sets 'continue' to ''collapse''
 			if either or both values are specified,
 			unless the ''line-clamp/-webkit-legacy'' keyword is also specified.