[css-grid-1] Handle fit-content() arg as limiting contributions in auto calculations. #3565

Author: fantasai

css-grid-1/Overview.bs

@@ -3971,6 +3971,7 @@ Resolve Intrinsic Track Sizes</h3>
 					The <dfn noexport id="limited-contribution" lt="limited min-content contribution | limited max-content contribution">limited min-/max-content contribution</dfn> of an item
 					is (for this purpose) its <a lt="min-content contribution">min-</a>/<a>max-content contribution</a> (accordingly);
 					limited by the <a>max track sizing function</a>
+					(which could be the argument to a ''fit-content()'' track sizing function)
 					if that is <a lt="fixed sizing function">fixed</a>,
 					else by it's own <a lt="min-content contribution">min-</a>/<a>max-content contribution</a>
 					if the <a>max track sizing function</a>