[selectors] fix typo

Author: tabatkins

selectors/Overview.bs

@@ -861,7 +861,7 @@ Pseudo-classing Pseudo-elements</h4>
 
 	<div class="example">
 		For example, since the '':hover'' pseudo-class specifies
-		that it can apply to any pseudo-element, 
+		that it can apply to any pseudo-element,
 		''::first-line:hover'' will match when the first line is hovered.
 		However, since neither '':focus'' nor ''::first-line''
 		define that '':focus'' can apply to ''::first-line'',
@@ -2502,7 +2502,7 @@ Child-indexed Pseudo-classes</h3>
 
 		<pre>
 		tr {
-			background: white; \
+			background: white;
 		}
 		tr:nth-child(even) {
 			background: silver;