[css-font-loading] typo

Author: tabatkins

css-font-loading/Overview.bs

@@ -484,7 +484,7 @@ The <code>FontFaceSet</code> Interface</h2>
 	none of its contained {{FontFace}} objects have a {{FontFace/status}} of <code>"loading"</code>.
 
 	For {{FontFaceSet}}s that are <a>font sources</a>,
-	in addition to the above constriant,
+	in addition to the above constraint,
 	the following must all be true
 	for them to be considered as having <a>no pending font loads</a>: