Some feedback about the preview section: /preview/typography: I was hoping to find out what font(s) I was looking at, but this page contains a history of typog

Some feedback about the preview section: /preview/typography: I was hoping to find out what font(s) I was looking at, but this page contains a history of typography. Looks like it's Helvetica? But I don't see the word Helvetica anywhere on the page. Maybe it's expected that the user will know why Helvetica is the right choice. from /preview/grid : "A collection of classes to build grid based layouts with absolute ease. This is the simplest grid system you'll love to use." This feels weirdly sales-y for documentation.