[selectors] Remove lingering references to 'feature' and 'feature selector'.

Author: tabatkins

selectors/Overview.bs

@@ -705,26 +705,25 @@ Guidance on Mapping Document Languages to DOM</h4>
 	element/neighbors in graph-based structures--
 	should be reflected as the child nodes of an element.
 
-	Other features of the element should be reflected as <a>features</a> when possible,
-	mapping to something that serves a similar purpose to the same feature in DOM:
+	Other features of the element should be mapped to something that serves a similar purpose to the same feature in DOM:
 
 	<dl>
 		<dt>type
 		<dd>
 			If the elements in the document language have some notion of "type"
 			as a basic distinguisher between different groups of elements,
-			it should be reflected as the "type" <a>feature</a>.
+			it should be reflected as the "type" feature.
 
 			If this "type" can be separated into a "basic" name
 			and a "namespace" that groups names into higher-level groups,
-			the latter should be reflected as the "namespace" <a>feature</a>.
-			Otherwise, the element shouldn't have a "namespace" <a>feature</a>,
-			and the entire name should be reflected as the "type" <a>feature</a>.
+			the latter should be reflected as the "namespace" feature.
+			Otherwise, the element shouldn't have a "namespace" feature,
+			and the entire name should be reflected as the "type" feature.
 
 		<dt>id
 		<dd>
 			If some aspect of the element functions as a unique identifier across the document,
-			it should be mapped to the "id" <a>feature</a>.
+			it should be mapped to the "id" feature.
 
 			Note: While HTML only allows an element to have a single ID,
 			this should not be taken as a general restriction.
@@ -735,7 +734,7 @@ Guidance on Mapping Document Languages to DOM</h4>
 		<dd>
 			Aspects of the element that are useful for identifying the element,
 			but are not generally unique to elements within a document,
-			should be mapped to the "class" or "attribute" <a>features</a>
+			should be mapped to the "class" or "attribute" features
 			depending on if they're something equivalent to a "label" (a string by itself)
 			or a "property" (a name/value pair)
 
@@ -974,7 +973,7 @@ Pseudo-classes</h3>
 	</div>
 
 	<a>Pseudo-elements</a> are <a>featureless</a>,
-	and so can't be matched by any <a>feature selector</a>.
+	and so can't be matched by any other selector.
 	They also do not affect the interpretation of <a>structural pseudo-classes</a>,
 	which are evaluated based solely on real elements.
 	Other <a>pseudo-classes</a> <em>can</em> match <a>pseudo-elements</a>,
@@ -1324,7 +1323,7 @@ Universal selector </h3>
 
 	Unless an element is <a>featureless</a>,
 	the presence of a <a>universal selector</a> has no effect on whether the element matches the selector.
-	(<a>Featureless</a> elements do not match any <a>feature</a> selector,
+	(<a>Featureless</a> elements do not match any selector,
 		including the <a>universal selector</a>.)
 
 	<div class="example">