polkadot-sdk-docs: Use command_macro! #15374

Job	Run time
preflight / preflight	41s
preflight / ci-versions	1m 8s
test-linux-stable-int	7m 34s
test-linux-stable-no-try-runtime (1/2)	33m 12s
test-linux-stable-no-try-runtime (2/2)	22m 28s
test-linux-stable-runtime-benchmarks	24m 37s
test-linux-stable (1/3, parity-large)	35m 24s
test-linux-stable (1/3, parity-oldlinux)	30m 19s
test-linux-stable (2/3, parity-large)	20m 21s
test-linux-stable (2/3, parity-oldlinux)	19m 1s
test-linux-stable (3/3, parity-large)	20m 58s
test-linux-stable (3/3, parity-oldlinux)	17m 5s
All tests passed	1s
	3h 52m 49s

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