[css-flexbox] Better wording of how order affects abspos in abspos section, as suggested by Rossen.

Author: fantasai

css-flexbox/Overview.bs

@@ -646,8 +646,9 @@ Flex Items</h2>
 <h3 id='abspos-items'>
 Absolutely-Positioned Flex Children</h3>
 
-	An absolutely-positioned child of a <i>flex container</i> does not participate in flex layout
-	beyond the <a href="#algo-flex-order">reordering step</a>.
+	An absolutely-positioned child of a <i>flex container</i> does not participate in flex layout.
+	However, it does participate in the <a href="#algo-flex-order">reordering step</a> (see 'order'), 
+	which has an effect in their painting order.
 
 	The <a href="http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width">static position</a>
 	of an absolutely-positioned child of a <a>flex container</a>
@@ -660,7 +661,7 @@ Absolutely-Positioned Flex Children</h3>
 
 	<div class='note'>
 		This belongs in Position,
-		but assume that the <dfn>static position</dfn> of a box
+		but assume that the <dfn>static position rectangle</dfn> of a box
 		is a rectangle,
 		usually (i.e. in block layout) corresponding to
 		the position of the “hypothetical box” described in
@@ -670,7 +671,7 @@ Absolutely-Positioned Flex Children</h3>
 	</div>
 
 	The <a>static position</a> of an absolutely positioned child of a <a>flex container</a>
-	is determined by setting the <a>static position</a> rectangle to the <a>flex container's</a> padding box,
+	is determined by setting the <a>static position rectangle</a> to the <a>flex container's</a> padding box,
 	then aligning the absolutely positioned child within this rectangle according to the 'justify-content' value of the <a>flex container</a>
 	and the 'align-self' value of the child itself.