It probably was legitimate. There are tons of people (myself included) that send PRs to fix typos and such. I also accept PRs like that to my own projects.
A lot more people will read the docs than the code, and typos are annoying and for some people highly distracting (OCD)
It probably was not legitimate. There are wonderful people like you but they are dwarfed by the thousands of scam accounts using this method to try and engineer legitimacy.
It's reassuring to know that I'm not the only one with this issue. Typos can be extremely disruptive, often compelling me to re-read the entire sentence.
A lot more people will read the docs than the code, and typos are annoying and for some people highly distracting (OCD)