[css-flexbox] Fix forking error.

Author: fantasai

css-flexbox/Overview.bs

@@ -2853,7 +2853,7 @@ Flex Container Intrinsic Cross Sizes</h4>
 Flex Item Intrinsic Size Contributions</h4>
 
 	The <strong>main-size <a>min-content contribution</a> of a <a>flex item</a></strong>
-	is its <em>outer</em> <a lt="min-content size">min-content</a>,
+	is its <em>outer</em> <a>min-content size</a>,
 	clamped by its <a>flex base size</a> as a maximum (if it is not growable)
 	and/or as a minimum (if it is not shrinkable),
 	and then further clamped by its <a lt="min main size property">min</a>/<a>max main size properties</a>.