"Advanced calculations" does not seem like the right subtitle for example gallery

[palewire]

For #2937

If you take a look at the charts in this section, some don't feel like calculations, or even all that advanced. For instance, the trellis plot reads more like a case study thanks to its historical reference in the title. And the isotype charts don't have any calculations at all. Could we think of a better subhed? Or perhaps move some of the charts to other subsections where they are a better fit?