docs: formatting change
docs: formatting change

Also provides a bit of structure to separate the primary API from 'utility' functions

ColinEberhardt/d3fc,ScottLogic/d3fc,ColinEberhardt/d3fc,d3fc/d3fc,d3fc/d3fc,jleft/d3-financial-components,chrisprice/d3fc,ScottLogic/d3fc,chrisprice/d3fc,chrisprice/d3fc,jleft/d3-financial-components,jleft/d3-financial-components,d3fc/d3fc,ColinEberhardt/d3fc,d3fc/d3fc,ScottLogic/d3fc