Fix typos and other minor readability issues

[elepedus]

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Thanks for creating this great resource! I spotted a few minor typos and readability issues as I was reading -- I hope you don't mind!

Also, in Section 5.3, where you mention some options for running a production-like Kubernetes setup locally, I though you might like to mention Garden.io. This little gem is basically real-time CI on your dev machine. Well worth a try :)

Thanks again, Ed