Clarify module page

Problem/Motivation

Originally the module page states:
"New field based on DateRange with a checkbox that makes the end date optional as per user choice."

But do you really create a new field type?
Does this module not only provide a field widet for the core date range field?

So if that is true it might read:
"New field widget extending the DateRange field widget with a checkbox that makes the end date optional as per user choice."

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes