Michel grey doc fixes

@atnnn, I updated the script to generate the python docs (the names for some comparison operators changed).
I just tested it, it works fine. The docs for the data explorer still works fine too.

I first changed the command fields in some commands to be an array, but I eventually decided to keep the complexity in the scripts and not in the docs.
The changes are in this commit: https://github.com/rethinkdb/docs/commit/4c6a74abde451a5b9151d17e0629250835082fe7

Let me know if that works for you.
If yes, I'll merge this with @Tryneus changes in master.