Add a notes section to the docs:
Add a notes section to the docs:

* Discuss representation error versus loss of significance.
* Document special values including qNaN, sNaN, +0, -0.
* Show the suprising display of non-normalized zero values.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator