Fix grammar

Author: Bryan

docs/content/releases/4.1.1.md

@@ -13,6 +13,6 @@
       * specialFractions
       * thousandsSeparator
   * Function behavior has changed.
-    * Passing a value which cannot will yield Number.NaN.
+    * Passing a value which cannot be parsed will yield Number.NaN.
     * Passing an invalid unit code will yield Number.NaN.
 * A formal enumeration, called UnitCode, was added.