build

docs: clarify dynamic completion features #16741

Job	Run time
Check formatting	16s
Build jj-lib without Git support	44s
cargo-deny (advisories)	24s
build (ubuntu-latest)	5m 2s
Check protos	30s
cargo-deny (bans licenses sources)	23s
build (macos-13)	8m 25s
Clippy check	2m 34s
build (macos-14)	3m 52s
Check that MkDocs can build the docs	9s
Check that MkDocs can build the docs with latest Python and uv	15s
build (windows-latest)	10m 34s
build (ubuntu-latest, --all-features)	6m 7s
	39m 15s

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