There's something weird going on with some commits in the history of rails and docrails. Problem seems to be a bug in the grit library ---used by the github editor--- uncovered by some recent changes in git related to time zones handling. Bottom line, git fsck reports some errors.
docrails won't be available until we get the repos clean somehow. It may take some time, and it may involve history rewrites. Let's see. We'll keep you posted.
In the meantime please create regular pull requests in rails for doc patches. And enjoy the pain as an exercise to strength your appreciation for docrails :).