Editorial: fix link and wording for tuple origin

Fixes whatwg#10999.

Author: zcorpan

source

@@ -87155,7 +87155,7 @@ dictionary <dfn dictionary>DragEventInit</dfn> : <span>MouseEventInit</span> {
 
    <dt>A <dfn export data-x="concept-origin-tuple">tuple origin</dfn></dt>
    <dd>
-    <p>A <span data-x="concept-origin-tuple">tuple</span> consists of:
+    <p>A <span>tuple</span> consisting of:
 
     <ul class="brief">
      <li>A <dfn export for="origin" data-x="concept-origin-scheme">scheme</dfn> (an <span>ASCII