build

docs: fix typo in `builtin_immutable_heads()` description #17389

Job	Run time
build (ubuntu-latest)	5m 12s
build (macos-13)	12m 54s
build (macos-14)	3m 48s
build (windows-latest)	10m 5s
build (ubuntu-latest, --all-features)	5m 59s
Build jj-lib without Git support	51s
cargo-deny (advisories)	26s
cargo-deny (bans licenses sources)	23s
Run doctests	2m 18s
Check protos	26s
Clippy check	2m 48s
Check that MkDocs can build the docs	13s
Check formatting	18s
Check that MkDocs can build the docs with latest Python and uv	15s
	45m 56s

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