docs: fix "From source" `cd` command #3420

Job	Run time
cross-compile (x86_64-unknown-illumos)	1m 32s
build (ubuntu-latest)	1m 32s
build (macos-14)	1m 26s
unit-test (ubuntu-latest)	4m 27s
build (windows-latest)	4m 2s
unit-test (macos-14)	1m 48s
check (ubuntu-latest)	2m 30s
unit-test (windows-latest)	6m 7s
check (macos-14)	27s
check (windows-latest)	2m 51s
clippy	1m 1s
format	9s
integration-test	3m 2s
	30m 54s

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