doc/userguide: document threshold backoff type #10233

Job	Run time
Prepare cbindgen	54s
Prepare dependencies	25s
AlmaLinux 9 (no jansson)	1m 3s
AlmaLinux 9 (Minimal/Recommended Build)	3m 34s
AlmaLinux 9	11m 47s
AlmaLinux 9 Test Templates	4m 40s
Debian 12	24m 44s
Debian 12 Dist Builder	5m 22s
Fedora 39 (clang, debug, asan, wshadow, rust-strict, systemd)	13m 30s
Fedora 39 (Suricata Verify codecov)	9m 48s
Fedora 39 (gcc, debug, asan, wshadow, rust-strict)	13m 50s
Fedora 40 (clang, debug, asan, wshadow, rust-strict, systemd)	9m 18s
Fedora 40 (gcc, debug, asan, wshadow, rust-strict)	8m 12s
Fedora 40 (non-root, debug, clang, asan, wshadow, rust-strict)	7m 18s
MacOS Latest	9m 39s
Ubuntu 24.04 (cocci)	22m 42s
Windows MSYS2 MINGW64 (libpcap)	26m 47s
Windows MSYS2 MINGW64 (NPcap)	29m 24s
Windows MSYS2 MINGW64 (WinDivert)	12m 19s
Ubuntu 22.04 (DPDK Build) (22.11.4)	18m 0s
Ubuntu 22.04 (DPDK Build) (21.11.6)	15m 40s
Ubuntu 22.04 (DPDK Build) (20.11.10)	14m 19s
Debian 11 (xdp)	7m 48s
Ubuntu 22.04 (DPDK Build) (19.11.14)	12m 57s
Debian 12 MSRV	25m 0s
Debian 10	7m 5s
Ubuntu 20.04 (-DNDEBUG)	9m 13s
Ubuntu 22.04 (fuzz corpus coverage)	11m 42s
Ubuntu 22.04 (Fuzz)	6m 4s
Ubuntu 22.04 (Minimal/Recommended Build)	2m 57s
Ubuntu 22.04 (Netmap build)	3m 14s
Ubuntu 24.04 (afpacket and dpdk live tests with ASAN)	12m 35s
Ubuntu 24.04 (pcap unix socket ASAN)	11m 28s
AlmaLinux 8	5m 3s
Ubuntu 22.04 (afpacket and dpdk coverage)	13m 3s
Ubuntu 22.04 (unix socket mode coverage)	8m 44s
Ubuntu 22.04 (unittests coverage)	7m 40s
Ubuntu 22.04 (Debug Validation)	9m 55s
Ubuntu 20.04 (unsupported rust)	1m 15s
CentOS Stream 9	8m 16s
	7h 7m 14s

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