[css-flexbox] Fix the reference to recalculating free space within the loop.

Author: tabatkins

css-flexbox/Overview.bs

@@ -2394,9 +2394,8 @@ Resolving Flexible Lengths</h3>
 
 				<li>
 					<strong>Recalculate free space.</strong>
-					Sum the outer <i>flex base sizes</i> of all items on the line,
-					and subtract this from the flex container's inner main size.
-					This is the free space.
+					Calculate the free space again,
+					according to the “Calculate free space” step before this loop.
 					<span class='note'>Note that this does not alter the desired free space of the items.</span>
 
 				<li>

css-flexbox/Overview.html

@@ -2396,9 +2396,8 @@ <h3 class="heading settled heading" data-level=9.7 id=resolve-flexible-lengths><
 
 				<li>
 					<strong>Recalculate free space.</strong>
-					Sum the outer <a data-link-type=dfn href=#flex-base-size title="flex base sizes">flex base sizes</a> of all items on the line,
-					and subtract this from the flex container’s inner main size.
-					This is the free space.
+					Calculate the free space again,
+					according to the “Calculate free space” step before this loop.
 					<span class=note>Note that this does not alter the desired free space of the items.</span>
 
 				<li>