build

[doc] ammend ivshmem_kvmfr to make cgroups and permissions clearer #2483

Job	Run time
host-linux	34s
docs	42s
host-windows-cross	1m 3s
client (gcc, g++, xdg-shell, Release)	43s
host-windows-native	1m 40s
client (gcc, g++, xdg-shell, Debug)	45s
client (gcc, g++, libdecor, Release)	45s
module	13s
obs (gcc)	35s
client (gcc, g++, libdecor, Debug)	50s
obs (clang)	27s
client (clang, clang++, xdg-shell, Release)	1m 10s
client (clang, clang++, xdg-shell, Debug)	41s
client (clang, clang++, libdecor, Release)	1m 4s
client (clang, clang++, libdecor, Debug)	45s
	11m 57s

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