docs: improve code block on mobile (#107)
docs: improve code block on mobile (#107)


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