Fix discrete orientation example in stat_summary#4152

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yutannihilation merged 2 commits intotidyverse:masterfrom

margoal1:fix/issue-4150-discrete-orientation-example

Jul 30, 2020

Commits on Jul 29, 2020

replace cyl with factor(cyl)
margoal1
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Commits on Jul 30, 2020

Regenerate docs
yutannihilation
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