ReST directive was used. Also fixed some other ReST directives that were
not correct and removed some warnings during buildbot checks.

Copied the docstring description

Invalid links and refences fixed.
SpaeseMat class documentation updated.

This reverts commit 4d36be87.

Conflicts:
	modules/ml/include/opencv2/ml/ml.hpp
	modules/ml/src/data.cpp

Documentation: fixed class/struc members documentation; added warning on incorrectly documented member

Some reST syntax correction. Now the PDF documentation builds correctly under Windows using MIKTEX. Some update on the tutorial structure. Some CSS syntax correction. Windows Install Tutorial v0.4.