changed docstrings to "observed states"
changed docstrings to "observed states"

BerkeleyAutomation/rlpy,BerkeleyAutomation/rlpy,rlpy/rlpy,MDPvis/rlpy,BerkeleyAutomation/rlpy,imanolarrieta/RL,MDPvis/rlpy,silgon/rlpy,silgon/rlpy,rlpy/rlpy,imanolarrieta/RL,rlpy/rlpy,imanolarrieta/RL,MDPvis/rlpy,silgon/rlpy