Update Finance and ML docs (qiskit-community/qiskit-aqua#938)

* Update to Finance and ML docs

* fix copyright

* Fix dead links

Co-authored-by: Manoel Marques <manoel@us.ibm.com>

qiskit/ml/__init__.py

@@ -16,10 +16,13 @@
 ===================================================
 Qiskit's Machine Learning module (:mod:`qiskit.ml`)
 ===================================================
-This is the machine learning domain logic....
 
 .. currentmodule:: qiskit.ml
 
+This is the Qiskit`s machine learning module. There is an initial set of function here that
+will be built out over time. At present it has sample sets that can be used with
+Aqua's :mod:`~qiskit.aqua.algorithms.classifiers`.
+
 Submodules
 ==========