[css-text] Add some notes about reduce-orphans

css-text-4/Overview.bs

@@ -5646,6 +5646,18 @@ Selecting How to Wrap: the 'text-wrap-style' property</h3>
 			beyond what ''text-wrap-style/auto''
 			if that comes at a significant performance cost.
 
+			Note: In western typography, an “orphan” typically refers to a single word on the last line of a paragraph.
+			However, not all languages or writing systems wrap lines at word boundaries,
+			and even in languages that do,
+			a few very short words on the last line may still be undesirable,
+			especially if the available inline space is long.
+			This specification does not therefore strictly define
+			lines to be too short only when they are composed a single word,
+			and lets the user agent be the judge of what is excessively short.
+
+			Note: See also the 'orphans' property for control over fragmentation
+			and the other typographic meaning of “orphans”.
+
 			<div class=example>
 				For instance, with the given line length, the following test would be wrapped with a single word on the last line,
 				which could be judged too short.