Update main-functions.md

Corrected typo.

Author: michelou

docs/docs/reference/changed-features/main-functions.md

@@ -60,7 +60,7 @@ The Scala compiler generates a program from a `@main` method `f` as follows:
 For instance, the `happyBirthDay` method above would generate additional code equivalent to the following class:
 ```scala
 final class happyBirthday {
-  import scala.util.{CommndLineParser => CLP}
+  import scala.util.{CommandLineParser => CLP}
   <static> def main(args: Array[String]): Unit =
     try
       happyBirthday(