Adapted minor spelling mistakes in the ReadMe.md

cooperative_cuisine/reinforcement_learning/README.md

 # Cooperative Cuisine and Reinforcement Learning
 
-Cooperative Cuisine can be used to train a reinforcment learning agent. In this implementation, [stable_baselines](https://github.com/hill-a/stable-baselines) rl algorithm are used.
+Cooperative Cuisine can be used to train a reinforcment learning agent. In this implementation, [stable_baselines](https://github.com/hill-a/stable-baselines) rl algorithms are used.
 
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