[css-text-decor] Improve hard-to-parse sentence. w3c#5158

Author: fantasai

css-text-decor-3/Overview.bs

@@ -175,8 +175,8 @@ Line Decoration: Underline, Overline, and Strike-Through</h2>
 	applied to it along with the descendant's text; it does not affect
 	calculation of the decoration's initial position on that line.
 	The 'visibility' property, 'text-shadow', filters, and other graphical transformations
-	likewise affect text decorations as part of the text they're drawn on,
-	even if the decorations were specified on an ancestor box,
+	likewise also affect all text decorations applied to that box--
+	including decorations propagated from an ancestor box--
 	and do not affect the calculation of their initial positions or thicknesses.
 	(In the case of line decorations drawn over an atomic inline
 	or across the margins/borders/padding of a non-replaced inline box,

css-text-decor-4/Overview.bs

@@ -118,8 +118,8 @@ Line Decoration: Underline, Overline, and Strike-Through</h2>
 	applied to it along with the descendant's text; it does not affect
 	calculation of the decoration's initial position on that line.
 	The 'visibility' property, 'text-shadow', filters, and other graphical transformations
-	likewise affect text decorations as part of the text they're drawn on,
-	even if the decorations were specified on an ancestor box,
+	likewise also affect all text decorations applied to that box--
+	including decorations propagated from an ancestor box--
 	and do not affect the calculation of their initial positions or thicknesses.
 	(In the case of line decorations drawn over an [=atomic inline=]
 	or across the margins/borders/padding of a [=non-replaced=] [=inline box=],