CIViC description field terminology inconsistent

[ahwagner]

The field for capturing human-readable text about an evidence item is stored in the description field in our data model, but is formally described as Statement in docs. This discrepancy can cause confusion to downstream consumers of CIViC content, and I recommend we either change our documentation (preferred) or our data model to align the term used to describe this.

The analogous field in Assertions is description (data model and documentation), and the analogous field in Variants is similarly confusing, called description in our data model and Summary in our documentation.

[ahwagner]

From discussion with @susannasiebert and @acoffman it sounds like the effort of resolving this in the data model is probably best reserved for v2.

The documentation is also aligned with what is presented in the web client.