build

[doc] kvmfr/libvirt: change double quotes to single quotes #2526

Job	Run time
host-windows-cross	51s
docs	37s
host-linux	35s
client (gcc, g++, xdg-shell, Release)	59s
host-windows-native	1m 24s
client (gcc, g++, xdg-shell, Debug)	48s
module	22s
client (gcc, g++, libdecor, Release)	48s
obs (gcc)	46s
client (gcc, g++, libdecor, Debug)	43s
obs (clang)	25s
client (clang, clang++, xdg-shell, Release)	1m 5s
client (clang, clang++, xdg-shell, Debug)	50s
client (clang, clang++, libdecor, Release)	1m 4s
client (clang, clang++, libdecor, Debug)	56s
	12m 13s

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