[css-font-loading] missing word

Author: tabatkins

css-font-loading/Overview.bs

@@ -823,7 +823,7 @@ The <code>load()</code> method</h3>
 <h3 id='font-face-set-check'>
 The <code>check()</code> method</h3>
 
-	The {{FontFaceSet/check()}} method of {{FontFaceSet}} will determine you can "safely"
+	The {{FontFaceSet/check()}} method of {{FontFaceSet}} will determine whether you can "safely"
 	render some provided text with a particular font list,
 	such that it won't cause a "font swap" later.
 	If the given text/font combo will render without attempting to use any unloaded or currently-loading fonts,