How to I update the website?

[F21]

I noticed some errors in the docs on the website. According to the 
documentation, the files are in /src/site/markdown: 
http://phoenix.apache.org/building_website.html

However, there is no src/site/markdown in the git repo on Github or the 
ASF repo. What's the current method for updating the website?

Cheers,

Francis