Fixup parenthesis placement in previous commit

f76d3c5 placed the parenthesis
incorrectly.

Also note that its commit message was incorrect in an important aspect:
public-suffix roots are *not* considered same-site to their subdomains.
Instead the relevant change was that public-suffix roots need to be
compute to the same site as versions of themselves with different ports.

source

@@ -80162,7 +80162,7 @@ interface <dfn>BarProp</dfn> {
    return <var>origin</var>.</p></li>
 
    <li><p>If <var>origin</var>'s <span data-x="concept-origin-host">host</span>'s <span>registrable
-   domain</span> is null, then return <var>origin</var>'s (<span
+   domain</span> is null, then return (<var>origin</var>'s <span
    data-x="concept-origin-scheme">scheme</span>, <var>origin</var>'s <span
    data-x="concept-origin-host">host</span>).</p></li>