"man man" says that the sections are:
1 Executable programs or shell commands
2 System calls (functions provided by the kernel)
3 Library calls (functions within program libraries)
4 Special files (usually found in /dev)
5 File formats and conventions eg /etc/passwd
6 Games
7 Miscellaneous (including macro packages and conventions), e.g.
man(7), groff(7)
8 System administration commands (usually only for root)
9 Kernel routines [Non standard]
Since there is no command named kresd.system it does not belong in section 8.
Section 7 includes conventions and useful patterns like gitcli(7), which seems more similar to the documentation that is supplied in kresd.systemd.