[css-break-3][meta] Close the <small>.

Author: tabatkins

css-break-3/Overview.bs

@@ -17,7 +17,7 @@ Ignored Terms: background positioning area, region chain, … message topic …,
 At Risk: the ''region'' and ''break-after/avoid-region'' values of 'break-*'
 </pre>
 
-<h1>CSS Fragmentation Module Level 3 <br> <small>Breaking the Web, one fragment at a time</h1>
+<h1>CSS Fragmentation Module Level 3 <br> <small>Breaking the Web, one fragment at a time</small></h1>
 
 <h2 id="intro">
 Introduction</h2>