docs: Fix installation command on macOS for stackablectl #276

Job	Run time
General Pull Request Checks / Run Cargo Deny (advisories)	44s
General Pull Request Checks / Run RustDoc	2m 4s
General Pull Request Checks / Run Clippy	1m 3s
General Pull Request Checks / Run Cargo Deny (bans licenses sources)	40s
General Pull Request Checks / Run Rustfmt	21s
General Pull Request Checks / Run Cargo Tests	59s
General Pull Request Checks / Run Cargo Udeps	1m 51s
General Pull Request Checks / All tests passed	1s
Build stackablectl for x86_64-unknown-linux-gnu	59s
Build stackablectl for aarch64-unknown-linux-gnu	3m 2s
Build stackablectl for x86_64-apple-darwin	1m 28s
Build stackablectl for aarch64-apple-darwin	1m 28s
	14m 40s

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