fix documentation, see https://github.com/jadejs/jade/issues/1970 #1973
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I know we don't want PRs for this, but my reason is to ask how to handle small doc updates like this.
Should I just re-run the script? Should I go directly into gh-pages and update manually?
Maybe we can write down our findings into a Contributing.md. I'm willing to get it started :)