English is likely not the first language of the volunteer who wrote these docs. If you want better documentation, I encourage you to write it yourself.
I assumed as much am not belittling the skills of a non-native speaker. I was just sort of surprised that a project that has been around so long hasn’t had better attention paid to its docs (my biggest FOSS experience is with PostgreSQL which is a bit of an outlier in just how good its docs are).
The project needs all the help it can get.