Update README.md

Author: yurchisin

optimization301/README.md

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 # Optimization 301 for Data Scientists!
 
-The material is from the [Optimization 301 for Data Scientists](https://whova.com/portal/webapp/Vti3dgwQi9Vkfd8AhCde/) training, which consists of two stets of hands-on modeling examples with exercises to help get from proof of concept to production.
+The material is from the [Optimization 301 for Data Scientists](https://whova.com/portal/webapp/Vti3dgwQi9Vkfd8AhCde/) training, which consists of two sets of hands-on modeling examples with exercises to help get from proof of concept to production.
 
 You can review the Jupyter Notebooks here. For all examples, a completed version is available. If you want to test yourself and try out some of the exercises, you should start with the not-completed-versions of the notebooks and then compare with the completed versions.