build

Improve the documentation of `jj prev` #10334

Job	Run time
Check that MkDocs can build the docs	27s
Check protos	32s
build (ubuntu-latest)	4m 3s
build (macos-14)	2m 55s
build (windows-latest)	10m 35s
Check formatting	15s
cargo-deny (advisories)	24s
build (ubuntu-latest, --all-features)	4m 54s
cargo-deny (bans licenses sources)	23s
Clippy check	2m 21s
Check that MkDocs can build the docs with Poetry 1.3.2	34s
	27m 23s

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