https://www.kernel.org/doc/man-pages/
My guess is make(1) is to distinguish from make(1p) - http://man7.org/linux/man-pages/man1/make.1p.html
Or just reflexively included just in case, because of commonly encountering potentially ambiguous situations that you just disambiguate by default, even for non-ambiguous situations.
https://www.kernel.org/doc/man-pages/
My guess is make(1) is to distinguish from make(1p) - http://man7.org/linux/man-pages/man1/make.1p.html