[css-sizing-3] Remove issue against min-content block size term

Author: fantasai

css-sizing-3/Overview.bs

@@ -218,11 +218,6 @@ Auto Box Sizes</h3>
 			: <dfn>min-content block size</dfn>
 			:: Equivalent to the <a>max-content block size</a>.
 
-				Issue: Or should this be the minimum between allowed break points?
-				It might make sense in multi-col contexts
-				to have min-content and max-content block-sizes be different,
-				even if they are the same elsewhere.
-
 		: <dfn>fit-content size</dfn>
 		: <dfn>fit-content inline size</dfn>
 		: <dfn>fit-content block size</dfn>