build

docs: update stale references to singular file() revset #14700

Job	Run time
build (ubuntu-latest)	4m 58s
build (macos-13)	7m 38s
build (macos-14)	4m 2s
build (windows-latest)	11m 15s
build (ubuntu-latest, --all-features)	5m 35s
Build jj-lib without Git support	1m 5s
cargo-deny (advisories)	24s
cargo-deny (bans licenses sources)	25s
Check protos	42s
Clippy check	3m 14s
Check that MkDocs can build the docs	27s
Check that MkDocs can build the docs with Poetry 1.8	47s
Check formatting	20s
	40m 52s

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