[css-sizing-4] Make it clearer that the two intrinsic axises are totally independent.

Author: tabatkins

css-sizing-4/Overview.bs

@@ -605,6 +605,15 @@ Max-content Sizes in Constrained-height Multi-column Layout</h3>
 		and measuring the resulting columns.
 
 
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 <h2 id="intrinsic-contribution">
 Intrinsic Size Contributions</h2>
@@ -672,6 +681,8 @@ Overriding Intrinsic Sizes: the 'intrinsic-*' properties</h3>
 			in the relevant axis.
 	</dl>
 
+	Note: The value of 'intrinsic-*' in one axis has no affect on the other axis.
+
 	<pre class="propdef shorthand">
 	Name: intrinsic-size
 	Value: <<'intrinsic-width'>> <<'intrinsic-height'>>?