[css-align] Fix incorrect applies-to lines; fixes #764

Author: fantasai

css-align/Overview.bs

@@ -1379,7 +1379,7 @@ Block/Cross-Axis Alignment: the 'align-items' property</h3>
 	Name: align-items
 	Value: normal | stretch | <<baseline-position>> | [ <<overflow-position>>? && <<self-position>> ]
 	Initial: normal
-	Applies to: block-level elements
+	Applies to: flex containers and grid containers
 	Inherited: no
 	Percentages: n/a
 	Media: visual
@@ -1400,12 +1400,12 @@ Self-Alignment Shorthand: the 'place-items' property</h3>
 	<pre class="propdef">
 	Name: place-items
 	Value: [ auto | normal | stretch | <<baseline-position>> | <<self-position>> ]{1,2}
-	Initial: auto
-	Applies to: block-level boxes, absolutely-positioned boxes, and grid items
+	Initial: see individual properties
+	Applies to: see individual properties
 	Inherited: no
 	Percentages: n/a
 	Media: visual
-	Computed value: specified value
+	Computed value: see individual properties
 	Animatable: no
 	</pre>