[css-values] Address conflict between clauses per w3c#708 (comment)

Author: fantasai

css-values-3/Overview.bs

@@ -1103,17 +1103,17 @@ Absolute lengths: the ''cm'', ''mm'', ''q'', ''in'', ''pt'', ''pc'', ''px'' unit
 	All of the absolute length units are <a>compatible</a>,
 	and ''px'' is their <a>canonical unit</a>.
 
-	For a CSS device, these dimensions are anchored either
+	For a CSS device, these dimensions are <dfn lt="anchor unit">anchored</dfn> either
 
 	<ol type=i>
 		<li>by relating the <a>physical units</a> to their physical measurements, or
 		<li>by relating the <a value>pixel unit</a> to the <a>reference pixel</a>.
 	</ol>
 
-	For print media,
+	For print media at typical viewing distances,
 	the anchor unit should be one of the standard physical units (inches, centimeters, etc).
 	For screen media (including high-resolution devices),
-	lower-resolution devices,
+	low-resolution devices,
 	and devices with unusual viewing distances,
 	it is recommended instead that the anchor unit be the pixel unit.
 	For such devices it is recommended that the pixel unit

css-values/Overview.bs

@@ -1189,17 +1189,17 @@ Absolute lengths: the ''cm'', ''mm'', ''q'', ''in'', ''pt'', ''pc'', ''px'' unit
 	All of the absolute length units are <a>compatible</a>,
 	and ''px'' is their <a>canonical unit</a>.
 
-	For a CSS device, these dimensions are anchored either
+	For a CSS device, these dimensions are <dfn lt="anchor unit">anchored</dfn> either
 
 	<ol type=i>
 		<li>by relating the <a>physical units</a> to their physical measurements, or
 		<li>by relating the <a value>pixel unit</a> to the <a>reference pixel</a>.
 	</ol>
 
-	For print media,
+	For print media at typical viewing distances,
 	the anchor unit should be one of the standard physical units (inches, centimeters, etc).
 	For screen media (including high-resolution devices),
-	lower-resolution devices,
+	low-resolution devices,
 	and devices with unusual viewing distances),
 	it is recommended instead that the anchor unit be the pixel unit.
 	For such devices it is recommended that the pixel unit