[css-align] Switch default justify/align-self value for root element to 'normal'.

Author: tabatkins

css-align/Overview.bs

@@ -680,7 +680,7 @@ Inline/Main-Axis Alignment: the 'justify-self' property</h3>
 	The <dfn value for="justify-self">auto</dfn> keyword computes to
 	the computed value of 'justify-items' on the parent
 	(minus any ''legacy'' keywords),
-	or ''start'' if the box has no parent.
+	or ''align-self/normal'' if the box has no parent.
 
 	The <dfn value for="justify-self">normal</dfn> keyword
 	represents the "default" alignment for the layout mode.
@@ -800,7 +800,7 @@ Block/Cross-Axis Alignment: the 'align-self' property</h3>
 
 	The <dfn value for="align-self">auto</dfn> keyword computes to
 	the computed value of 'align-items' on the parent
-	or ''start'' if the box has no parent.
+	or ''align-self/normal'' if the box has no parent.
 
 	The <dfn value for="align-self">normal</dfn> keyword
 	represents the "default" alignment for the layout mode.
@@ -1181,6 +1181,12 @@ Changes</h2>
 	* Fixed handling of ''justify-self: stretch'' (and 'align-self') to allow shrinking, as defined in Flexbox.
 	* Made justify/align-content:auto computte to their respective behaviors for flex and grid containers.
 
+<h2 id="privacy-security">
+Privacy and Security Considerations</h2>
+
+	As a simple layout spec,
+	this introduces no new privacy or security considerations.
+
 <h2 class=no-num id="acknowledgments">
 Acknowledgments</h2>