Made several grammatical corrections based on comments from Daniel Barcla <danielb@digitalfocus.com>.
Made several grammatical corrections based on comments from Daniel
Barcla <danielb@digitalfocus.com>.

Also added example of what happens when a parameter is set both
positionally and by a keyword (one of Daniels suggestions related to
that paragraph).

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