[css-tables-3] Remove vestiages of min-width percents

WG resolved to ignore percent min-width for column widths in w3c#607 but
not everything was removed.

css-tables-3/Overview.bs

@@ -1259,7 +1259,7 @@ spec:css-sizing-3; type:property; text:box-sizing
 				<!--——————————————————————————————————————————————————————————————————————————-->
 				<dt><dfn>percentage contribution</dfn>s</dt>
 				<dd>The percentage contribution of a table cell, column, or column group
-						is defined in terms of the computed values of 'width', 'max-width', and 'min-width'
+						is defined in terms of the computed values of 'width' and 'max-width'
 						that have computed values that are percentages:<br/>
 					<br/>
 					<code>min(percentage 'width', percentage 'max-width')</code>.<br/>
@@ -1779,9 +1779,6 @@ spec:css-sizing-3; type:property; text:box-sizing
 			<figcaption>Overview of the width distribution algorithm. Not normative.</figcaption>
 		</figure>
 
-		ISSUE(607): Should min-width support percentages?
-
-
 		<h5 id="width-distribution-in-fixed-mode">Changes to width distribution in fixed mode</h5>
 
 			The following changes to previous algorithm apply <a>in fixed mode</a>: