[css-inline-3] Drop reference to CSS2.1 now that its text has been incorporated. Clean up related wording.

Author: fantasai

css-inline-3/Overview.bs

@@ -954,33 +954,30 @@ Inline Box Heights: the 'inline-sizing' property</h3>
 
 	This property specifies how the <a>logical height</a>
 	of the <a>content area</a> of an <a>inline box</a>
-	is measured
-	and how it is aligned with its contents.
-	(It has no effect on the size or position of the box’s contents.)
+	is measured in relation to its contents.
+	It has no effect on the size or position of the box’s contents,
+	the line box, or any other content.
 	Values have the following meanings:
 
 	<dl dfn-for="inline-sizing" dfn-type=value>
 		<dt><dfn>normal</dfn>
 		<dd>
 			The <a>content area</a> of the <a>inline box</a>
-			is sized and position to fit its (possibly hypothetical) text
-			as specified in <a href="https://www.w3.org/TR/CSS2/visudet.html#inline-non-replaced">CSS2&sect;10.6.1</a>.
+			is sized and position to fit its (possibly hypothetical) text,
+			see below.
 
 		<dt><dfn>stretch</dfn>
 		<dd>
-			Once the line box has been sized,
+			Once the line box has been sized and its contents positioned
+			as for ''inline-sizing/normal'',
 			the final <a>logical height</a> of the <a>inline box</a>’s <a>content area</a>
 			is calculated as the <a>stretch fit</a>
 			into the line box,
 			and it is positioned such that its <a>margin edges</a>
 			coincide with the line box’s edges.
 	</dl>
 
-	Issue: We might want to use this opportunity to more precisely define ''inline-sizing/normal'',
-	rename it to match,
-	and possibly introduce any other values that may seem necessary.
-
-	The 'height' property does not apply.
+	The 'height' property does not apply to [=inline boxes=].
 	The height of the content area should be based on the font,
 	but this specification does not specify how.
 	A UA may, e.g., use the the maximum ascender and descender of the font.