[css-sizing-3] Trivial fixes to definitions.

Author: fantasai

css-sizing-3/Overview.bs

@@ -171,7 +171,7 @@ Terminology</h2>
 		<dd>
 			The <a>stretch fit</a> into a given size
 			is that size,
-			minus the element's computed margins (not collapsed, treating ''margin/auto'' as zero),
+			minus the box's computed margins (not collapsed, treating ''margin/auto'' as zero),
 			border, and padding in the given dimension
 			(such that the outer size is a perfect fit),
 			and flooring at zero
@@ -263,6 +263,8 @@ Auto Box Sizes</h3>
 			If the <a>available space</a> in a given axis is <a>definite</a>,
 			equal to <code>clamp([=min-content size=], [=stretch-fit size=], [=max-content size=])</code>
 			(i.e. <code>max(<a>min-content size</a>, min(<a>max-content size</a>, <a>stretch-fit size</a>))</code>).
+			When sizing under a [=min-content constraint=],
+			equal to the [=min-content size=].
 			Otherwise, equal to the <a>max-content size</a> in that axis.
 
 			Note: This is called the “shrink-to-fit” width in <a href="https://www.w3.org/TR/CSS2/visudet.html#float-width">CSS2.1§10.3.5</a>
@@ -275,7 +277,8 @@ Auto Box Sizes</h3>
 			(Some uses of this term may refer also to sizes
 			derived primarily from one of these two sizes.)
 
-			[=Replaced elements=] frequently derive this from their [=natural dimensions=].
+			[=Replaced elements=] frequently derive their [=intrinsic size=]
+			from their [=natural dimensions=].
 	</dl>
 
 <h3 id='contributions'>
@@ -369,8 +372,8 @@ Preferred Size Properties: the 'width' and 'height' properties</h4>
 	Animation type: by computed value type, recursing into ''width/fit-content()''
 	</pre>
 
-	The 'width' and 'height' properties specify
-	the <dfn export lt="preferred size">preferred</dfn> (<a>physical</a>)
+	The 'width' and 'height' ([=physical=]) properties specify
+	the <dfn export lt="preferred size">preferred</dfn>
 	<dfn export lt="width | preferred width">width</dfn>
 	and <dfn export lt="height | preferred height">height</dfn> of the box, respectively.