Modify the description of spatialNavigationSearch()

Author: Jihye Hong

css-nav-1/Overview.bs

@@ -543,10 +543,10 @@ the User Agent must run the steps described below:
     4. Let <var>insideFirst</var> be the value of {{SpatialNavigationSearchOptions/inside}} attribute of <var>options</var>
         if it is not <code>null</code>, <code>false</code> otherwise.
     5. If <var>insideFirst</var> is <code>true</code>,
-        then let <var>bestCandidate</var> be the result of <a>selecting the best candidate</a> within element with <var>direction</var>.
+        then let <var>bestCandidate</var> be the result of <a>selecting the best candidate</a> among <var>areas</var> within the element with <var>direction</var>.
         * If <var>bestCandidate</var> is not <code>null</code>, return <var>bestCandidate</var>. 
         * Else, fall back to the next step.
-    6. Return the result of <a>selecting the best candidate</a> within <var>areas</var> in <var>direction</var> from the element.
+    6. Return the result of <a>selecting the best candidate</a> among <var>areas</var> in <var>direction</var> from the element.
 
 Note: When neither a container nor a list of candidates is provided,
 this only searches through the visible focusable areas of the nearest