Fix for minor typo in columns-explanation.html

docs/_includes/columns-explanation.html

@@ -18,7 +18,7 @@
     <li><strong>Sortedness (1-10)</strong>:</li>
     <ul>
         <li>How sorted the cards are in terms of gameplay order, roughly speaking.</li>
-        <li>Games are generally non-linear, so this value only accounts for that portion of gameplay this is predictable.</li>
+        <li>Games are generally non-linear, so this value only accounts for that portion of gameplay that is predictable.</li>
     </ul>
     <li><strong>Quality (1-10)</strong>:</li>
     <ul>