[css-rhythm-1] Collapse img for Bikeshed (w3c#5948)

Co-authored-by: Tab Atkins Jr <jackalmage@gmail.com>

Author: nschonni

css-rhythm-1/Overview.bs

@@ -406,9 +406,7 @@ by making heights of all lines an integer multiple of the <a>step unit</a>.
 
 	<div class="example">
 		<div class="figure" style="float:right">
-			<img src="images/line-grid-center.svg"
-			style="height: 300px"
-			>
+			<img src="images/line-grid-center.svg" style="height: 300px">
 		</div>
 
 		In the following example,