Fix font-family example

Author: fantasai

css3-values/Overview.html

@@ -537,7 +537,7 @@ <h3 id=value-examples><span class=secno>2.5. </span> Property value
      <tr>
       <td>‘<code class=property>font-family</code>’
 
-      <td>&lt;family-name>#
+      <td>[ &lt;family-name> | &lt;generic-family> ]#
 
       <td>‘<code class=css>"Gill Sans", Futura, sans-serif</code>’
 

css3-values/Overview.src.html

@@ -249,7 +249,7 @@ <h3 id="value-examples">
 				    <td>none | underline || overline || line-through || blink
 				    <td>''overline underline''
 				<tr><td>'font-family'
-				    <td>&lt;family-name>#
+				    <td>[ &lt;family-name> | &lt;generic-family> ]#
 				    <td>''"Gill Sans", Futura, sans-serif''
 				<tr><td>'border-width'
 				    <td>[ &lt;length> | thick | medium | thin ]{1,4}