[css-sizing-4][editorial] Bikeshed fixes

Author: tabatkins

css-sizing-4/Overview.bs

@@ -22,6 +22,7 @@ spec:css2; type: property
 	text: min-height
 	text: max-width
 	text: max-height
+spec:css-align-3; type:value; text:stretch
 </pre>
 
 
@@ -748,7 +749,7 @@ Stretch-fit Sizing: filling the containing block</h3>
 	</div>
 
 
-<h3 id="contain-fit-sizing">
+<h3 id="contain-fit-sizing" dfn lt="contain-fit sizing" export>
 Contain-fit Sizing: stretching while maintaining an aspect ratio</h3>
 
 	Contain-fit sizing essentially applies stretch-fit sizing,