[css-align] Clarify parent/child relationship of auto values per w3c#440 (comment)

Author: fantasai

css-align/Overview.bs

@@ -892,7 +892,7 @@ Inline/Main-Axis Alignment: the 'justify-self' property</h3>
 
 	The <dfn value for="justify-self">auto</dfn> keyword is interpreted as
 	''justify-self/normal'' if the box is absolutely positioned or has no parent,
-	and as the computed value of 'justify-items' on the parent
+	and as the computed 'justify-items' value of the parent box
 	(minus any ''legacy'' keywords)
 	otherwise.
 
@@ -1099,7 +1099,7 @@ Block/Cross-Axis Alignment: the 'align-self' property</h3>
 
 	The <dfn value for="align-self">auto</dfn> keyword is interpreted as
 	''align-self/normal'' if the box is absolutely positioned or has no parent,
-	and as the computed value of 'align-items' on the parent
+	and as the computed 'align-items' value of the parent box
 	otherwise.
 
 	The <dfn value for="align-self">normal</dfn> keyword
@@ -1340,7 +1340,7 @@ Inline/Main-Axis Alignment: the 'justify-items' property</h3>
 	Animatable: no
 	</pre>
 
-	This property specifies the default 'justify-self' for all of the boxes
+	This property specifies the default 'justify-self' for all of the child boxes
 	(including anonymous boxes)
 	participating in this box's formatting context.
 	Values have the following meanings:
@@ -1392,7 +1392,7 @@ Block/Cross-Axis Alignment: the 'align-items' property</h3>
 	Animatable: no
 	</pre>
 
-	This property specifies the default 'align-self' for all of the boxes
+	This property specifies the default 'align-self' for all of the child boxes
 	(including anonymous boxes)
 	participating in this box's formatting context.
 	Values have the following meanings: