After speaking with @mcarrano and @mceledonia, we'd like to move Sparkline to it's own page under Charts (remove from area chart examples). We also saw that the implementation did not match the design - there should be a 1 px line marking the data points (as we do with line chart) and the opaque area fill should be 10% opacity of that same line color (i.e. line is #0066cc and area fill is #0066cc at 10% opacity).

Assuming you'd be the best person to point this to! @dlabrecq