build

doc: add note about huge TLB when using fw-download #3130

Job	Run time
make static	37s
fallback shared libraries	1m 29s
cross (armhf)	48s
default (clang, release)	34s
muon minimal static	31s
default (gcc, debug)	26s
default (clang, debug)	31s
cross (s390x)	51s
default (gcc, release)	39s
cross (ppc64le)	44s
build libnvme and nvme-cli separately	44s
	7m 54s

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