Slide 17 in Reactivity missing

[erge19736]

Slide 17 (showing the graph of how reactivity works) that is present in the recording1 is missing in ShinyDeveloperConference/Reactivity/slides.Rmd

(On a related note, slides in github differ from slides in the recording.)

[1] https://www.rstudio.com/resources/webinars/shiny-developer-conference/