Fix YAML Errors in "Formats" section

[zoracon]

Parsing errors in read the docs showed this parsing error. Ran things through YAML validation to make sure this time the config files are set.

[bmw]

So I went to the readthedocs site, logged in, picked a project built from this repo (I used https://readthedocs.org/projects/eff-certbot/), and added this GitHub branch as an "active but hidden" version at https://readthedocs.org/projects/eff-certbot/versions/ which triggered a build. The error message shown there is still "No default configuration file found at repository's root."

Is the problem maybe that readthedocs requires the config file to be in the root of the git repo rather than in a subdirectory? If so, maybe there's a way to conditionally set values in the YAML file depending on the project being built?

[bmw]

Regardless of that though, this change seems correct to me so feel free to merge.

[zoracon]

Is the problem maybe that readthedocs requires the config file to be in the root of the git repo rather than in a subdirectory? If so, maybe there's a way to conditionally set values in the YAML file depending on the project being built?

Yup, I have to set the directory manually in the admin settings.