add nestedVirtualization documentation to default.yaml #6620

Job	Run time
Colima tests (QEMU, Linux host) (v0.6.5)	14m 21s
Lints	2m 1s
Integration tests (QEMU, macOS host)	9m 35s
Integration tests (QEMU, Linux host) (alpine.yaml)	6m 0s
Integration tests (QEMU, Linux host) (debian.yaml)	7m 32s
Spell check	11s
Integration tests (QEMU, Linux host) (fedora.yaml)	6m 26s
Integration tests (QEMU, Linux host) (archlinux.yaml)	7m 51s
Unit tests (1.22.x)	1m 34s
Upgrade tests (QEMU, macOS host) (v0.15.1)	8m 40s
Integration tests (QEMU, Linux host) (opensuse.yaml)	7m 22s
Unit tests (1.23.x)	4m 8s
Integration tests (QEMU, Linux host) (docker.yaml)	7m 17s
Integration tests (QEMU, Linux host) (../hack/test-templates/alpine-iso-9p-writable.yaml)	5m 25s
VMNet tests (QEMU)	7m 55s
Integration tests (vz) (default.yaml, true)	8m 24s
Windows tests	2m 4s
Integration tests (QEMU, Linux host) (../hack/test-templates/net-user-v2.yaml)	6m 41s
Integration tests (vz) (fedora.yaml, false)	9m 6s
Integration tests (QEMU, Linux host) (../hack/test-templates/test-misc.yaml)	19m 19s
	2h 21m 52s

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