Hi @Rohit Masur, if you want to setup a vagrant box pre-installed with Apache Hadoop 3.0 that should be fine. Although Apache Hadoop 3.0 is a fast-moving target right now (still in Alpha) so it may be better to have good documentation.
If the existing installation guide is wrong, please do call that out on the hadoop-user mailing list. Even better if you can file an Apache Hadoop Jira and post a patch to fix the documentation. Feel free to tag me on the Apache Jira if you need any help submitting the patch.