[css-sizing-3] Make min-content block size definition a bit less prescriptive. w3c#3684

Author: fantasai

css-sizing-3/Overview.bs

@@ -222,7 +222,9 @@ Auto Box Sizes</h3>
 				and the “minimum content width” in <a href="https://www.w3.org/TR/CSS2/tables.html#auto-table-layout">CSS2.1§17.5.2.2</a>.
 
 			: <dfn>min-content block size</dfn>
-			:: Equivalent to the <a>max-content block size</a>.
+			:: In general,
+				and definitely for block-level and inline-level boxes,
+				this is equivalent to the <a>max-content block size</a>.
 
 		: <dfn>fit-content size</dfn>
 		: <dfn>fit-content inline size</dfn>