Editorial: consistently format the empty string keyword

source

@@ -81421,7 +81421,7 @@ body { display:none }
      <td rowspan="2">Writing suggestions should be offered on this element.
     </tr>
     <tr>
-     <td>(The empty string)
+     <td>(the empty string)
     <tr>
      <td><dfn attr-value for="html-global/writingsuggestions"><code
       data-x="attr-writingsuggestions-false">false</code></dfn>