Correct typo (#1244)

Author: jugglinmike

docs/index.bs

@@ -2515,7 +2515,7 @@ spec: webappsec-referrer-policy; urlPrefix: https://w3c.github.io/webappsec-refe
       1. Run the <a>Update Registration State</a> algorithm passing |registration|, "<code>installing</code>" and null as the arguments.
       1. Run the <a>Update Worker State</a> algorithm passing |registration|'s <a>waiting worker</a> and *installed* as the arguments.
       1. Invoke <a>Finish Job</a> with |job|.
-      1. Wait for all the <a>tasks</a> <a lt="queue a task">queued</a> by <a>Update Worker State</a> invoked in this algorithm have executed.
+      1. Wait for all the <a>tasks</a> <a lt="queue a task">queued</a> by <a>Update Worker State</a> invoked in this algorithm to have executed.
       1. Invoke [=Try Activate=] with |registration|.
 
           Note: If [=Try Activate=] does not trigger [=Activate=] here, [=Activate=] is tried again when the last client controlled by the existing [=active worker=] is [=Handle Service Worker Client Unload|unloaded=], {{ServiceWorkerGlobalScope/skipWaiting()}} is asynchronously called, or the [=extend lifetime promises=] for the existing [=active worker=] settle.