[css-sizing] Remove %s from intrinsic-*, as they're not useful during intrinsic sizing calculations.

Author: tabatkins

css-sizing-4/Overview.bs

@@ -621,12 +621,12 @@ Overriding Intrinsic Sizes: the 'intrinsic-*' properties</h3>
 
 	<pre class="propdef">
 	Name: intrinsic-block-size, intrinsic-inline-size, intrinsic-height, intrinsic-width
-	Value: legacy | auto | <<length-percentage>>
+	Value: legacy | auto | <<length>>
 	Initial: legacy
 	Inherited: no
 	Applies to: all elements except [=non-replaced=] [=inlines=]
 	Computed value: as specified, with <<length-percentage>> values computed
-	Percentages: relative to width/height of [=containing block=]
+	Percentages: n/a
 	Animation type: by computed value type
 	</pre>
 
@@ -654,7 +654,7 @@ Overriding Intrinsic Sizes: the 'intrinsic-*' properties</h3>
 			in that axis.
 			Otherwise same as ''legacy''.
 
-		: <dfn><<length-percentage>></dfn>
+		: <dfn><<length>></dfn>
 		::
 			Specifies an [=explicit intrinsic inner size=]
 			in the relevant axis.