The handbook says about the memoryuse field in login.conf(5)
> The maximum amount of memory a process may consume at any given time. It
> includes both core memory and swap usage. This is not a catch-all limit for
> restricting memory consumption, but is a good start.
This is clearly incorrect. The memoryuse field accounts for core memory usage only. The man page login.conf(5) is correct in this regard.
> Maximum of core memory use size limit.
Please fix the handbook.
Table 14.1 in https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/security-resourcelimits.html