Fix misleading information

index.html

@@ -285,7 +285,7 @@ <h3>`.v()`</h3>
 <h3>`.w()`</h3>
 <p>Returns `this.reverse()`.</p>
 <h3>`.x()`</h3>
-<p>Returns `this` reduced with `+`. If all items are numbers, this sums them.</p>
+<p>Returns the sum of all items in `this`.</p>
 <h3>`.y()`</h3>
 <p>If `this` is a 2D array, or an array of strings, transposes rows with columns.</p>
 <h3>`.z(n=1)`</h3>