Fix <dl><li> breakage in build

Author: garykac

sections/event-types-mouseevent.txt

@@ -623,13 +623,15 @@
 
 		<h5 id="mouseevent-internal-state">Internal State for MouseEvent</h5>
 
-			<dl dfn-for="MouseEvent">
-				<li><dfn>shift flag</dfn></li>
-				<li><dfn>control flag</dfn></li>
-				<li><dfn>alt flag</dfn></li>
-			    <li><dfn>altgraph flag</dfn></li>
-				<li><dfn>meta flag</dfn></li>
-			</dl>
+			A {{MouseEvent}} has the following internal flags that are used to track the
+			state of various modifier keys:
+				<dfn>shift flag</dfn>,
+				<dfn>control flag</dfn>,
+				<dfn>alt flag</dfn>,
+			    <dfn>altgraph flag</dfn>,
+				and <dfn>meta flag</dfn>.
+			These flags are set if the corresponding modifier key was pressed at the time
+			of the mouse event.
 
 		<div class="algorithm" data-algorithm="initialize-a-mouseevent" data-export>
 		<h5 id="initialize-a-mouseevent-id"><dfn>initialize a MouseEvent</dfn></h5>