[documentation] small README changes #81

Job	Run time
build-on-windows (windows-debug)	50s
build-on-linux (linux-kvm-debug)	51s
build-on-windows (windows-release)	50s
build-on-linux (linux-kvm-release)	51s
build-on-linux (linux-hyperv-debug)	1m 0s
build-on-linux (linux-hyperv-release)	57s
fuzzing / fuzz	9m 44s
rust / build (windows-2022-debug)	15m 35s
rust / build (linux-kvm-debug)	9m 49s
rust / build (linux-hyperv-debug)	10m 6s
rust / build (windows-2022-release)	22m 17s
rust / build (linux-kvm-release)	14m 17s
rust / build (linux-hyperv-release)	14m 45s
	1h 41m 52s

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