Merge pull request #3294 from hax/patch-1

typo

Author: tabatkins

selectors-4/Overview.bs

@@ -3786,7 +3786,7 @@ Appendix A: Guidance on Mapping Source Documents &amp; Data to an Element Tree</
 			depending on if they're something equivalent to a "label" (a string by itself)
 			or a "property" (a name/value pair)
 
-		<dt>pseudo-classes and pseudo-attributes
+		<dt>pseudo-classes and pseudo-elements
 		<dd>
 			If any elements match any pseudo-classes or have any pseudo-elements,
 			that must be explicitly defined.