Add missing hadoop-mapreduce module API javadocs (#1869)
Add missing hadoop-mapreduce module API javadocs (#1869)

* Include missing hadoop-mapreduce module's classes to the generated
  javadocs when building the aggregate javadocs for the public API to
  publish on the website
* Sort list of javadoc classes
* Add comment in the profile explaining how to run
mjwall/accumulo,mjwall/accumulo,apache/accumulo,ctubbsii/accumulo,apache/accumulo,milleruntime/accumulo,phrocker/accumulo-1,milleruntime/accumulo,phrocker/accumulo-1,ctubbsii/accumulo,mjwall/accumulo,milleruntime/accumulo,phrocker/accumulo-1,milleruntime/accumulo,ctubbsii/accumulo,ctubbsii/accumulo,phrocker/accumulo-1,ctubbsii/accumulo,milleruntime/accumulo,apache/accumulo,mjwall/accumulo,mjwall/accumulo,phrocker/accumulo-1,phrocker/accumulo-1,milleruntime/accumulo,ctubbsii/accumulo,apache/accumulo,apache/accumulo,ctubbsii/accumulo,mjwall/accumulo,mjwall/accumulo,apache/accumulo,milleruntime/accumulo,apache/accumulo,phrocker/accumulo-1