[css-overflow-3] Clean up some spec cross-references.

Author: fantasai

css-overflow-3/Overview.bs

@@ -1051,8 +1051,9 @@ Forcing a Break After a Set Number of Lines: the 'max-lines' property</h3>
 	<div class=note>
 		Note: Despite the “region break” name, this is not a dependency on [[CSS-REGIONS-1]].
 		The word “region” is only used as a classifier for forced breaks:
-		they can be “page breaks” (break pages), “column breaks” (breaks multicol),
-		or “region breaks” (break any other kind of css-induced fragmentainers).
+		they can be “page breaks” (breaks across pages [[css-page-3]]),
+		“column breaks” (breaks across multi-column layout columns [[css-multicol-1]]),
+		or “region breaks” (breaks across any other kind of CSS-induced <a>fragmentation containers</a>).
 
 		If an implementation supports neither [[CSS-REGIONS-1]] nor [[CSS-OVERFLOW-4#fragmentation]],
 		then it will have had no occasion yet to run into that kind of breaks,
@@ -1061,7 +1062,9 @@ Forcing a Break After a Set Number of Lines: the 'max-lines' property</h3>
 		All that is needed is:
 
 		* be able to fragment
-		* classify these fragmentation containers as "category3" (i.e. not pages nor multicol) for the purpose of forced breaks.
+		* classify these fragmentation containers as “Category 3”
+			(i.e. not pages nor columns)
+			for the purpose of forced breaks.
 	</div>
 
 <h3 id="continue">