[css-syntax-3] Fix up references.

Author: fantasai

css-syntax-3/Overview.bs

@@ -399,7 +399,7 @@ The input byte stream</h3>
 
 	Note: [[CSSOM]] defines <a href="https://drafts.csswg.org/cssom/#requirements-on-user-agents-implementing-the-xml-stylesheet-processing-instruction">the environment encoding for <code>&lt;xml-stylesheet?></code></a>.
 
-	Note: [[CSS3CASCADE]] defines <a href="https://drafts.csswg.org/css-cascade/#at-ruledef-import">the environment encoding for <code>@import</code></a>.
+	Note: [[CSS-CASCADE-3]] defines <a href="https://drafts.csswg.org/css-cascade/#at-ruledef-import">the environment encoding for <code>@import</code></a>.
 
 
 <h3 id="input-preprocessing">
@@ -1975,7 +1975,8 @@ Parse something according to a CSS grammar</h4>
 	and if it does,
 	to destructure it according to the grammar.
 	This section provides a generic hook for this kind of operation.
-	It should be invoked like "parse <var>foo</var> as a CSS <<color>>", or similar.
+	It should be invoked like
+	<span class="informative">"parse <var>foo</var> as a CSS <<color>>"</span>, or similar.
 
 	Note: As a reminder, this algorithm, along with all the others in this section,
 	can be called with a string,
@@ -2783,7 +2784,7 @@ The <code>&lt;an+b></code> type</h3>
 The Unicode-Range microsyntax</h2>
 
 	Some constructs,
-	such as the 'unicode-range' descriptor for the ''@font-face'' rule,
+	<span class="informative">such as the 'unicode-range' descriptor for the ''@font-face'' rule</span>,
 	need a way to describe one or more unicode code points.
 	The <dfn>&lt;urange></dfn> production represents a range of one or more unicode code points.
 
@@ -3181,8 +3182,8 @@ Style rules</h3>
 	that associates a <a>selector list</a> [[!SELECT]]
 	with a list of property declarations.
 	They are also called
-	<a href="https://www.w3.org/TR/CSS21/syndata.html#rule-sets">rule sets</a> in [[!CSS21]].
-	CSS Cascading and Inheritance [[!CSS3CASCADE]] defines how the declarations inside of style rules participate in the cascade.
+	<a href="https://www.w3.org/TR/CSS2/syndata.html#rule-sets">rule sets</a> in [[!CSS2]].
+	CSS Cascading and Inheritance [[!CSS-CASCADE-3]] defines how the declarations inside of style rules participate in the cascade.
 
 	The prelude of the qualified rule is [=CSS/parsed=]
 	as a <<selector-list>>.
@@ -3573,7 +3574,7 @@ Changes from CSS 2.1 and Selectors Level 3</h3>
 			but not in any way that should impact its use in practice.
 
 		<li>
-			Apply the <a href="https://www.w3.org/TR/CSS21/syndata.html#unexpected-eof">EOF error handling rule</a> in the tokenizer
+			Apply the <a href="https://www.w3.org/TR/CSS2/syndata.html#unexpected-eof">EOF error handling rule</a> in the tokenizer
 			and emit normal <<string-token>> and <<url-token>> rather than BAD_STRING or BAD_URI
 			on EOF.