[css-text-4] Tweak wording as suggested by @nigelmegitt #1973 (comment)

css-text-4/Overview.bs

@@ -1032,10 +1032,11 @@ Line Start/End Padding: the 'line-padding' property</h3>
 			<p><span>Here is <em>some text</em></p>
 		</xmp>
 
-		If it renders such that there is a break between “some” and “text”,
-		line-padding will be inserted such that
+		Line-padding will be inserted such that
 		an extra 0.5em of inline background will be visible
-		on each side of each line:
+		on each side of each line.
+		If it renders such that there is a break between “some” and “text”,
+		the the additional padding will be:
 		on the first line, black on the left and green on the right,
 		and on the second line, green on both sides.