Editorial: grammar fix

See #603 (review).

dom.bs

@@ -829,7 +829,7 @@ it, and optionally given a <a>Realm</a> <var>realm</var>, run these steps:</p>
   signaling, and <var>dictionary</var>.
 
   <p class=example id=example-timestamp-initialization>In macOS the time of the occurrence for input
-  actions are available via the <code>timestamp</code> property of <code>NSEvent</code> objects.
+  actions is available via the <code>timestamp</code> property of <code>NSEvent</code> objects.
 
  <li><p>Initialize <var>event</var>'s {{Event/isTrusted}} attribute to true.
 
@@ -9762,6 +9762,7 @@ Elisée Maurer,
 Elliott Sprehn,
 Eric Bidelman,
 Erik Arvidsson,
+Gary Kacmarcik,
 Gavin Nicol,
 Geoffrey Sneddon,
 Giorgio Liscio,