[css-backgrounds] Markup fix.

Author: tabatkins

css-backgrounds-3/Overview.src.html

@@ -1540,7 +1540,7 @@ <h3 id="the-border-style">Line Patterns: the 'border-style' properties</h3>
 
 <p>Values have the following meanings:
 
-<dl dfn-type=value dfn-for="<<line-style>>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border">
+<dl dfn-type=value dfn-for="<line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border">
   <dt><dfn>none</dfn>
   <dd>
   No border. Color and width are ignored (i.e., the border has width 0).
@@ -1686,7 +1686,7 @@ <h3 id="the-border-width">Line Thickness: the 'border-width' properties</h3>
 
 <pre class=prod><dfn><<line-width>></dfn> = <<length>> | thin | medium | thick</pre>
 
-<p dfn-type=value dfn-for="<<line-width>>, border-width, border-top-width, border-left-width, border-bottom-width, border-right-width, border">
+<p dfn-type=value dfn-for="<line-width>, border-width, border-top-width, border-left-width, border-bottom-width, border-right-width, border">
 The lengths corresponding to <dfn>thin</dfn>, <dfn>medium</dfn>, and <dfn>thick</dfn>
 are not specified, but the values are constant throughout a
 <span>document</span> and thin &le; medium &le; thick. A UA could,