[css-flexbox][css-grid] Remove now-incorrect text about align-self:au…

…to and abspos static position; Align now defines this correctly. #440.

css-flexbox/Overview.bs

@@ -676,8 +676,7 @@ Absolutely-Positioned Flex Children</h3>
 	assuming both the child and the flex container
 	were fixed-size boxes of their used size.
 	For this purpose,
-	a value of ''align-self: auto'' is treated identically to ''align-self/start'',
-	and ''margin/auto'' margins are treated as zero.
+	''margin/auto'' margins are treated as zero.
 
 	<div class="note">
 		In other words,

css-grid/Overview.bs

@@ -3325,9 +3325,6 @@ With a Grid Container as Parent</h3>
 	whose edges coincide with the padding edges of the <a>grid container</a>.
 	However, if the <a>grid container</a> parent is also the generator of the absolutely positioned element's <a>containing block</a>,
 	instead use the <a>grid area</a> determined in [[#abspos-items]].
-	For the purpose of calculating this static position,
-	a value of ''align-self/auto'' for 'align-self'/'justify-self'
-	behaves as ''align-self/start''.
 
 	Note: Note that this position is affected by the values of 'justify-self' and 'align-self' on the child,
 	and that, as in most other layout models,