Someone else posted a writeup about it.

It wasn't in documentation, but a code comment. No user would see this.

One part was a rejected change on the README, which was trying to remove this "white supremacist language":

## On ideologically motivated changes

This is a purely technical project. As such, it is not an appropriate arena to advertise your personal politics or religious beliefs. Any changes that appear ideologically motivated will be rejected.

Someone changing "he" to "they" (original PR that started all this) in a comment as their only change could absolutely be seen as "politically motivated." My understanding is that if changing the comment was part of some larger useful change, it would be fine (as would using "she" or "they" in a new comment), but just changing the gender of a pronoun in a comment is a useless change.

If the comment said "she," would someone have been motivated to make this change? Probably not. Should changing this from "she" to some other pronoun (he or they) also be rejected? Yes, on the same grounds as changing it from "he," it's not a useful change and just wastes everyone's time. If you're in the code already, then go ahead, correct silly language like this if you care to.