fix broken link

Author: mattgarrish

epub34/authoring/index.html

@@ -10839,7 +10839,7 @@ <h3>Syntax</h3>
 
 				<div class="note">
 					<p>For more information about specifying the <code>height</code> and <code>width</code> properties
-						and their expected values, refer to <a href="#sec-fxl-content-dimensions"></a>.</p>
+						and their expected values, refer to <a href="#sec-content-dimensions"></a>.</p>
 
 					<p>Although the <code>viewport meta</code> tag allows the use of properties other than
 							<code>height</code> and <code>width</code>, as well as to omit values for the