The documentation contains example code and the developer who wrote it was probabaly trying to be funny by including an import to an imaginary Java package:
The line is just there to indicate that you can also import any third party package you might need in your custom Content Deployer Modules. The code is purely example code, as is this line:
//imaginary appserver API
AppManager server = CachingAppServer.getManagerInstance();
So there is no way you can actually compile this code, it is purely there to indicate how you can write a custom Content Deployer Module.