[css-sizing-3] Restructure sentence defining minimum contribution to be easier to read. Fix markup error and accidental use of size in place of contribution.

Author: fantasai

css-grid-1/Overview.bs

@@ -4003,17 +4003,17 @@ Resolve Intrinsic Track Sizes</h3>
 					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 smallest outer size it can have.
-					Specifically, it is the outer size
-					that would result from assuming
+					is the smallest <a>outer size</a> it can have.
+					Specifically,
+					if the item’s computed <a>preferred size</a> [=behaves as auto=]
+					or depends on the size of its <a>containing block</a> in the relevant axis,
+					its <a>minimum contribution</a> is
+					the <a>outer size</a> 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>
-					('width' or 'height', whichever matches the relevant axis)
-					if its computed <a>preferred size</a> [=behaves as auto=]
-					or depends on the size of the container in the relevant axis;
-					else is the item’s <a>min-content contribution</a>.
-					Because the <a>minimum size</a> often depends
+					as its <a>preferred size</a>;
+					else the item’s <a>minimum contribution</a> is
+					its <a>min-content contribution</a>.
+					Because the <a>minimum contribution</a> often depends
 					on the size of the item’s content,
 					it is considered a type of <a>intrinsic size contribution</a>.
 
@@ -4826,7 +4826,7 @@ Clarifications</h4>
 			is taken from the minimum size.
 			(<a href="https://github.com/w3c/csswg-drafts/issues/3612">Issue 3612</a>)
 			<blockquote>
-					The <dfn noexport id="min-size-contribution">minimum contribution</dfn> of an item
+					The <a>minimum contribution</a> of an item
 					is the smallest outer size it can have.
 					Specifically, it is the outer size
 					that would result from assuming