[css-inline] Sync CSS2/CSS2.1 references.

Author: fantasai

css-inline/Overview.bs

@@ -41,7 +41,7 @@ but is otherwise unstyleable.
 
 <h2 id="line-height">Line Heights and Baseline Alignment</h2>
 
-<p class="issue">This section is being rewritten. Refer to <a href="https://www.w3.org/TR/CSS2/visudet.html#line-height">section 10.8</a> of [[CSS21]] for the normative CSS definition or the <a href="https://www.w3.org/TR/2002/WD-css3-linebox-20020515/">2002 Working Draft</a> if you want pretty pictures. (But ignore the old text, half of it's wrong. We're not specifying which half, that's to be determined.)
+<p class="issue">This section is being rewritten. Refer to <a href="https://www.w3.org/TR/CSS2/visudet.html#line-height">section 10.8</a> of [[CSS2]] for the normative CSS definition or the <a href="https://www.w3.org/TR/2002/WD-css3-linebox-20020515/">2002 Working Draft</a> if you want pretty pictures. (But ignore the old text, half of it's wrong. We're not specifying which half, that's to be determined.)
 <strong>The CSS2 specification should be used as the guideline for implementation.</strong></p>
 
 Issue: The CSSWG would like to know which baseline values are necessary: if any can be dropped, or any need to be added.
@@ -192,7 +192,7 @@ Alignment Point: 'alignment-baseline' longhand</h4>
 	</dl>
 
 	For the following definitions, the <i>alignment subtree</i>
-	is as defined in [[!CSS21]].
+	is as defined in [[!CSS2]].
 
 	<dl dfn-for=alignment-baseline dfn-type=value>
 		<dt><dfn>top</dfn>
@@ -445,7 +445,7 @@ The following properties apply to an <a>initial letter</a>:
 	<li>all background properties (see [[CSS3BG]])
 	<li>any typesetting properties that apply to inline elements (see [[CSS3TEXT]])
 	<li>all text decoration properties (see [[CSS3-TEXT-DECOR]])
-	<li>all margin, border and padding properties  (see [[CSS21]] and [[CSS3BG]])
+	<li>all margin, border and padding properties  (see [[CSS2]] and [[CSS3BG]])
 </ul>
 
 Note: Which properties apply to <a>initial letter</a> depend on whether it is an inline box or an <a>initial letter</a> box, as <a>initial letter</a> is a display type.