[commands] Add until() as alias for withInterrupt() (#3981)

This is a clearer description for the functionality.
Will deprecate withInterrupt next year.

wpilibNewCommands/src/main/native/include/frc2/command/RunCommand.h

@@ -16,7 +16,7 @@ namespace frc2 {
 /**
  * A command that runs a Runnable continuously.  Has no end condition as-is;
  * either subclass it or use Command.WithTimeout() or
- * Command.WithInterrupt() to give it one.  If you only wish
+ * Command.Until() to give it one.  If you only wish
  * to execute a Runnable once, use InstantCommand.
  *
  * This class is provided by the NewCommands VendorDep