Ok, I get you. What you can do is go to it's GitHub repository and search the code for that typo. I think you should be able to search all of the files for it.

Then what you do is either open an issue and write in where in the code the typo is or, even better, fork the code into your own GitHub profile, find the typo again, edit the file, and fix it. Once the change is made, you should see a way to commit the change. Then go back to the dev's repository and open a Pull Request (PR). You'll be able to see the change you made and give a little description for the developer so they can approve it.