Documentation for the 113.00 release has not been generated. Alternatives:

• The documentation for 111.28.00 was generated with opam-doc, and works quite well, but is quite old now (since opam-doc was never updated to work with OCaml 4.02).
• The documentation for 112.17 was generated with a new tool called codoc, which hasn't really matched it in feature-completeness yet, and produces unattractive output. We're waiting for upcoming changes in our code and tooling which will make this all a lot easier and neater.
• In the meantime, just reading the interface files is always up-to-date :)