[css-text-3] Fix bikeshed errors

Author: kojiishi

css-text/Overview.bs

@@ -134,7 +134,7 @@ Module Interactions</h3>
 <h3 id="values">
 Values</h3>
 
-  This specification follows the <a href="https://www.w3.org/TR/CSS21/about.html#property-defs">CSS property definition conventions</a> from [[!CSS2]].
+  This specification follows the <a href="https://www.w3.org/TR/CSS21/about.html#property-defs">CSS property definition conventions</a> from [[!CSS21]].
   Value types not defined in this specification are defined in CSS Values & Units [[!CSS-VALUES-3]].
   Other CSS modules may expand the definitions of these value types.
 
@@ -1670,7 +1670,7 @@ Word Spacing: the 'word-spacing' property</h3>
 <!--  -->:lang(en) { word-spacing: 100%; }</pre>
 
     <p>The following example will <em>add</em> half the the width of the
-      &ldquo;0&rdquo; glyph to word spacing character [[CSS3VAL]]:
+      &ldquo;0&rdquo; glyph to word spacing character [[CSS-VALUES-3]]:
     <pre>p { word-spacing: 0.5ch; }</pre>
   </div>