build

doc: add RSS limitations in mlx4 guide #1933

Job	Run time
fedora:37	7s
ubuntu-20.04-gcc-mini	56s
ubuntu-20.04-gcc-stdatomic	12m 29s
ubuntu-20.04-clang-stdatomic	2m 14s
ubuntu-20.04-gcc-debug+doc+examples+tests	15m 7s
ubuntu-20.04-clang-asan+doc+tests	23m 29s
ubuntu-20.04-gcc-static-i386	1m 56s
ubuntu-20.04-gcc-static-mingw	3m 1s
ubuntu-20.04-gcc-shared-aarch64	2m 8s
ubuntu-20.04-gcc-ppc64le	2m 4s
ubuntu-20.04-gcc-riscv64	3m 18s
fedora:37-gcc	2m 31s
fedora:37-clang	2m 29s
	1h 11m 49s

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