[css-text-3] Editorial: remove a comma

This makes sure the word "typically" is seen as applying to both
clauses.

See w3c#5938

Author: frivoal

css-text-3/Overview.bs

@@ -4188,7 +4188,7 @@ Hyphenation: the 'hyphens' property</h3>
 	is the controlled splitting of words
 	where they usually would not be allowed to break
 	to improve the layout of paragraphs,
-	typically splitting words at syllabic or morphemic boundaries,
+	typically splitting words at syllabic or morphemic boundaries
 	and visually indicating the split
 	(usually by inserting a hyphen, U+2010).
 	In some cases, hyphenation may also alter the spelling of a word.