doc(lib/es5): Fix grammar in DateConstructor.UTC documentation (#34509)

This fixes #34507.

src/lib/es5.d.ts

@@ -873,12 +873,12 @@ interface DateConstructor {
     /**
      * Returns the number of milliseconds between midnight, January 1, 1970 Universal Coordinated Time (UTC) (or GMT) and the specified date.
      * @param year The full year designation is required for cross-century date accuracy. If year is between 0 and 99 is used, then year is assumed to be 1900 + year.
-     * @param month The month as an number between 0 and 11 (January to December).
-     * @param date The date as an number between 1 and 31.
-     * @param hours Must be supplied if minutes is supplied. An number from 0 to 23 (midnight to 11pm) that specifies the hour.
-     * @param minutes Must be supplied if seconds is supplied. An number from 0 to 59 that specifies the minutes.
-     * @param seconds Must be supplied if milliseconds is supplied. An number from 0 to 59 that specifies the seconds.
-     * @param ms An number from 0 to 999 that specifies the milliseconds.
+     * @param month The month as a number between 0 and 11 (January to December).
+     * @param date The date as a number between 1 and 31.
+     * @param hours Must be supplied if minutes is supplied. A number from 0 to 23 (midnight to 11pm) that specifies the hour.
+     * @param minutes Must be supplied if seconds is supplied. A number from 0 to 59 that specifies the minutes.
+     * @param seconds Must be supplied if milliseconds is supplied. A number from 0 to 59 that specifies the seconds.
+     * @param ms A number from 0 to 999 that specifies the milliseconds.
      */
     UTC(year: number, month: number, date?: number, hours?: number, minutes?: number, seconds?: number, ms?: number): number;
     now(): number;