[Doc] Revise description of ListView selection API
[Doc] Revise description of ListView selection API

This is an attempt to clarify how the selection API of ListView is
supposed to be used. Specifically, that the difference between the
ListView.selectXXX methods is only semantical.

Change-Id: If8fa3bd1942ac09f8deceef438896014cea8d815

eclipsesource/tabris-js,eclipsesource/tabris-js,eclipsesource/tabris-js