[css-box] Fix link

Author: fantasai

css-box-3/Overview.bs

@@ -234,7 +234,7 @@ Box-edge Keywords {#keywords}
 		<dt><dfn>view-box</dfn>
 			<dd>
 				Refers to the nearest [=SVG viewport=]’s
-				<dfn dfn lt="SVG viewport origin box">origin box</dfn>,
+				<dfn dfn lt="SVG viewport origin box" local-lt="origin box">origin box</dfn>,
 				which is a rectangle with the width and height
 				of the [=SVG viewport=],
 				positioned such that its top left corner is anchored

css-box-4/Overview.bs

@@ -233,7 +233,7 @@ Box-edge Keywords {#keywords}
 		<dt><dfn>view-box</dfn>
 			<dd>
 				Refers to the nearest [=SVG viewport=]’s
-				<dfn dfn lt="SVG viewport origin box">origin box</dfn>,
+				<dfn dfn lt="SVG viewport origin box" local-lt="origin box">origin box</dfn>,
 				which is a rectangle with the width and height
 				of the [=SVG viewport=],
 				positioned such that its top left corner is anchored