Fix invalid variable names starting with numbers

Author: lauracs24

Sprint-1/2-mandatory-errors/4.js

@@ -1,2 +1,5 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+// The error occurs because variable names cannot start with numbers
+// JavaScript identifiers must begin with a letter, $ or _
+
+const twelveHourClockTime = "20:53";
+const twentyFourHourClockTime = "08:53";