build

doc: add note about huge TLB when using fw-download #3128

Job	Run time
cross (ppc64le)	51s
make static	43s
cross (armhf)	50s
build libnvme and nvme-cli separately	41s
muon minimal static	37s
default (gcc, debug)	25s
cross (s390x)	53s
default (clang, release)	39s
default (clang, debug)	31s
default (gcc, release)	39s
fallback shared libraries	0s
	6m 49s

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