Fix any typos you find in any of the notes
One good way to earn the hacktoberfest t-shirt, contribute to the project and also learn a few things along the way (as you'd read all the notes) is to detect any typos or issues with spelling.
For any such occasion, feel free to open a PR linked to this issue (not close it, as it is an on-going one) and I'll be happy to merge it.
Can you please label this as hacktoberfest?
@bruceyboy86 I've added the hacktoberfest topic to the repo. I believe that is sufficient to include it in digital ocean's hacktoberfest?
In #3 all spelling errors for clean architecture were addressed. What's left is to do the same for the java concurrency book notes.