build

Make a minor formatting change to the help page for `jj parallelize` #10371

Job	Run time
cargo-deny (advisories)	25s
build (ubuntu-latest)	4m 3s
cargo-deny (bans licenses sources)	23s
build (macos-14)	2m 57s
Check protos	50s
build (windows-latest)	9m 28s
build (ubuntu-latest, --all-features)	5m 18s
Clippy check	2m 21s
Check that MkDocs can build the docs	23s
Check that MkDocs can build the docs with Poetry 1.3.2	40s
Check formatting	13s
	27m 1s

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