Editorial: Remove unused "parent worker global scope" variable

Also fixes a nearby typo.

source

@@ -115943,7 +115943,7 @@ interface <dfn interface>SharedWorkerGlobalScope</dfn> : <span>WorkerGlobalScope
   can be used by user agents as a way to avoid the cost of restarting a shared worker used by a site
   when the user is navigating from page to page within that site.</p>
 
-  <p>A worker is said to be an <dfn>active needed worker</dfn> if any its <span data-x="owner
+  <p>A worker is said to be an <dfn>active needed worker</dfn> if any of its <span data-x="owner
   set">owners</span> are either <code>Document</code> objects that are <span>fully active</span> or
   <span data-x="active needed worker">active needed workers</span>.</p>
 
@@ -115972,12 +115972,6 @@ interface <dfn interface>SharedWorkerGlobalScope</dfn> : <span>WorkerGlobalScope
    <li><p>Let <var>owner</var> be the <span>relevant owner to add</span> given <var>outside
    settings</var>.</p></li>
 
-   <li><p>Let <var>parent worker global scope</var> be null.</p>
-
-   <li><p>If <var>owner</var> is a <code>WorkerGlobalScope</code> object (i.e., we are creating a
-   nested dedicated worker), then set <var>parent worker global scope</var> to
-   <var>owner</var>.</p></li>
-
    <li><p>Let <var>unsafeWorkerCreationTime</var> be the <span>unsafe shared current
    time</span>.</p></li>