Some environment pages have incorrect/buggy descriptions

[colinmorris]

• RepeatCopy: the goal is to copy, reverse, copy. The description makes it sound like the goal is copy, reverse, copy, copy. Not clear what m represents. "revert" should be "reverse".
• Reverse: there is no special character r. (The agent just reads a blank space any time it falls off either end.)
• DuplicatedInput: characters are replicated two times, not three.
• MountainCarContinuous has some kind of markup error: System Message: WARNING/2 (<string>, line 4) Explicit markup ends without a blank line; unexpected unindent.

Somewhat related: I think it'd be helpful to have some documentation on the environment categories, in cases where the environments within have significant commonalities. For example, all the Algorithmic environments share roughly the same input/observation space, and have the same termination conditions. The PyGame section could have installation instructions in the section header, rather than repeating them in each env description. The Atari envs also have a lot of repetition in their descriptions.

[stale]

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