[css-text-4] Fix typo

This caused the spec to say the opposite of what it was trying to say.

Fixes w3c#1593

Author: frivoal

css-text-4/Overview.bs

@@ -1022,8 +1022,8 @@ Character Class Spacing: the 'text-spacing' property</h3>
 
 		<dt><dfn>space-end</dfn>
 		<dd>
-			Set <a>fullwidth opening punctuation</a> with full-width glyphs (spaced)
-			at the start of each line.
+			Set <a>fullwidth closing punctuation</a> with full-width glyphs (spaced)
+			at the end of each line.
 
 		<dt><dfn>trim-end</dfn>
 		<dd>