small grammar fix

Author: annevk

css3-mediaqueries/Overview.html

@@ -542,7 +542,7 @@ <h2 id=syntax><span class=secno>3. </span>Syntax</h2>
  : S* media_query [ ',' S* media_query]*
  ;
 media_query
- : [ONLY | NOT] S* media_type S* [ AND S* expression ]*
+ : [ONLY | NOT]? S* media_type S* [ AND S* expression ]*
  | expression [ AND S* expression ]*
  ;
 media_type
@@ -571,7 +571,9 @@ <h2 id=syntax><span class=secno>3. </span>Syntax</h2>
 {num}{D}{P}{C}{M} {return RESOLUTION;}</pre>
 
   <p><code>RESOLUTION</code> is to be added to the CSS2 <code>term</code>
-   production.
+   production and <code>NOT</code>, <code>ONLY</code>, <code>AND</code>, and
+   <code>&lsquo;<code class=css>,</code>&rsquo;</code> are to be added to the
+   CSS2 <code>value</code> production.
 
   <p>CSS style sheets are generally case-insensitive, and this is also the
    case for media queries.

css3-mediaqueries/Overview.src.html

@@ -426,7 +426,7 @@ <h2>Syntax</h2>
  : S* media_query [ ',' S* media_query]*
  ;
 media_query
- : [ONLY | NOT] S* media_type S* [ AND S* expression ]*
+ : [ONLY | NOT]? S* media_type S* [ AND S* expression ]*
  | expression [ AND S* expression ]*
  ;
 media_type
@@ -455,7 +455,9 @@ <h2>Syntax</h2>
 {num}{D}{P}{C}{M} {return RESOLUTION;}</pre>
 
 <p><code>RESOLUTION</code> is to be added to the CSS2
-<code>term</code> production.</p>
+<code>term</code> production and <code>NOT</code>, <code>ONLY</code>,
+<code>AND</code>, and <code>','</code> are to be added to the CSS2
+<code>value</code> production.</p>
 
 <p>CSS style sheets are generally case-insensitive, and this is
 also the case for media queries.</p>