The Article describing Repo Hosting with diffusion seems broken:
https://secure.phabricator.com/book/phabricator/article/diffusion_hosting/
thats true for other docs as well.
Error raised:
>>> UNRECOVERABLE FATAL ERROR <<<
Call to undefined method DivinerRemarkupRuleSymbol::isTextFlat()
/core/lib/phabricator/src/applications/diviner/markup/DivinerRemarkupRuleSymbol.php:37