[css-grid-1] Clarify that minimum contribution is a type of intrinsic size contribution

Author: fantasai

css-grid-1/Overview.bs

@@ -4000,8 +4000,9 @@ Resolve Intrinsic Track Sizes</h3>
 					set the track's <a>base size</a>
 					to the maximum of its items’ <a>minimum contributions</a>,
 					floored at zero.
-					The <dfn noexport id="min-size-contribution">minimum contribution</dfn> of an item is
-					the outer size that would result from assuming
+					The <dfn noexport id="min-size-contribution">minimum contribution</dfn> of an item,
+					which is considered a type of <a>intrinsic size contribution</a>,
+					is the outer size that would result from assuming
 					the item’s used <a>minimum size</a>
 					('min-width' or 'min-height', whichever matches the relevant axis)
 					as its <a>preferred size</a>
@@ -4749,6 +4750,14 @@ Clarifications</h4>
 			particularly 'grid-template-rows' and 'grid-template-columns'.
 			(<a href="https://github.com/w3c/csswg-drafts/pull/3198">PR 3198</a>,
 			 <a href="https://github.com/w3c/csswg-drafts/issues/3201">Issue 3201</a>)
+		<li id="change-2017-minimum-intrinsic-contribution">
+			Clarify that the <a>minimum contribution</a> is a type of <a>intrinsic size contribution</a>.
+			(<a href="https://github.com/w3c/csswg-drafts/issues/3660">Issue 3660</a>)
+			<blockquote>
+				<p>The <a>minimum contribution</a> of an item<ins>,
+				which is considered a type of <a>intrinsic size contribution</a>,</ins>
+				is the outer size that would result&hellip;
+			</blockquote>
 	</ul>
 
 <h3 id="changes-2016">