chore: fixup bikeshed issues

Author: marcoscaceres

index.bs

@@ -72,6 +72,7 @@ urlPrefix: https://drafts.csswg.org/css2/visuren.html
 spec: css-values-3; type: dfn
 	text: absolute length
 	text: dimension
+spec:html; type:attribute; text:document
 </pre>
 
 <h2 id='introduction'>Introduction</h2>
@@ -651,7 +652,7 @@ To <dfn>run the update intersection observations steps</dfn> for a
 	2. For each |target| in |observer|'s internal {{[[ObservationTargets]]}} slot, processed in the same order that {{observe()}} was called on each |target|:
 		1. Let:
 			- |thresholdIndex| be 0.
-			- |isIntersecting| be |false|.
+			- |isIntersecting| be false.
 			- |targetRect| be a {{DOMRectReadOnly}} with |x|, |y|, |width|, and |height| set to 0.
 			- |intersectionRect| be a {{DOMRectReadOnly}} with |x|, |y|, |width|, and |height| set to 0.
 		2. If the <a>intersection root</a> is not the <a>implicit root</a>,