I'm not seeing how this is an error. The manual page for git-remote
seems to address what `set-url` does and what `add` does.

Hello, there is an error in the manual.

Hello.

$git remote --help
or im my case I enter incorrect command
$git remote list

The help message:

usage: git remote [-v | --verbose]
...
  or: git remote set-url --add <name> <newurl>

If to type command according to help message, the error appears:

$ git remote --add gitverse https://repository.domain/MyName/MyRepository
error: unknown option `add' ...

You didn't use the command offered in the help message:

$ git remote set-url --add

Use it to add a url to a remote. As far as I can tell everything is
working and documented correctly here.