[css-syntax] Reword.

Author: tabatkins

css-syntax/Overview.html

@@ -4035,10 +4035,10 @@ <h3 id=anb-syntax><span class=secno>6.1. </span> Informal Syntax
   <h3 id=the-anb-type><span class=secno>6.2. </span> The <a
    href="#anb-production"><code>&lt;an+b></code></a> type</h3>
 
-  <p> The <a href="#anb0"><var>An+B</var></a> notation is defined using a
-   slightly different tokenizer than the rest of CSS, resulting in a somewhat
-   odd definition when expressed in terms of CSS tokens. This section
-   describes how to recognize the <a href="#anb0"><var>An+B</var></a>
+  <p> The <a href="#anb0"><var>An+B</var></a> notation was originally defined
+   using a slightly different tokenizer than the rest of CSS, resulting in a
+   somewhat odd definition when expressed in terms of CSS tokens. This
+   section describes how to recognize the <a href="#anb0"><var>An+B</var></a>
    notation in terms of CSS tokens (thus defining the <a
    href="#anb-production"><var>&lt;an+b></var></a> type for CSS grammar
    purposes), and how to interpret the CSS tokens to obtain values for <a

css-syntax/Overview.src.html

@@ -2986,7 +2986,7 @@ <h3 id="the-anb-type">
 The <code>&lt;an+b></code> type</h3>
 
 	<p>
-		The <var>An+B</var> notation is defined using a slightly different tokenizer than the rest of CSS,
+		The <var>An+B</var> notation was originally defined using a slightly different tokenizer than the rest of CSS,
 		resulting in a somewhat odd definition when expressed in terms of CSS tokens.
 		This section describes how to recognize the <var>An+B</var> notation in terms of CSS tokens
 		(thus defining the <var>&lt;an+b></var> type for CSS grammar purposes),