[css-flexbox] Add previous change to changes section.

--HG--
extra : rebase_source : 826581bba118d271ed9a75bbb0c31d8d049ee826

Author: tabatkins

css-flexbox/Overview.html

@@ -2744,6 +2744,8 @@ <h2 class="no-num heading settled heading" id=changes><span class=content>Change
 			An omitted <a class=property data-link-type=propdesc href=#propdef-flex-basis title=flex-basis>flex-basis</a> component of the <a class=property data-link-type=propdesc href=#propdef-flex title=flex>flex</a> shorthand now resolves to <span class=css data-link-type=maybe>0%</span> instead of <span class=css data-link-type=maybe>0px</span>.
 		<li>
 			Defined that an unresolvable percentage <a href=#flex-base-size>flex base size</a> is treated as <a class=css-code data-link-for=width data-link-type=value>auto</a>.
+		<li>
+			Simplified the static position of abspos children of <a href=#flex-container>flex containers</a> to be consistent with Grid Layout.
 	</ul>
 
 	<p>The following significant clarifications were also made:

css-flexbox/Overview.src.html

@@ -2764,6 +2764,8 @@ <h2 class="no-num" id="changes">Changes</h2>
 			An omitted 'flex-basis' component of the 'flex' shorthand now resolves to ''0%'' instead of ''0px''.
 		<li>
 			Defined that an unresolvable percentage <i>flex base size</i> is treated as <a value for=width>auto</a>.
+		<li>
+			Simplified the static position of abspos children of <a>flex containers</a> to be consistent with Grid Layout.
 	</ul>
 
 	<p>The following significant clarifications were also made: