Clarify description
Clarify description

Co-authored-by: Nokome Bentley <3b7153038beac96b4ad219726fa9bd15af2ddfc7@stenci.la>
stencila/stencila,stencila/stencila,stencila/stencila,stencila/stencila,stencila/stencila,stencila/stencila,stencila/stencila