clippy: Fix new `doc_lazy_continuation` lint #486

Job	Run time
cargo fmt	8s
cargo test nightly (macOS-latest)	23s
cargo test msrv	1m 3s
cargo test nightly (windows-2019)	47s
Docs (macOS-latest)	17s
cargo test nightly (ubuntu-latest)	24s
cargo clippy+test (macOS-latest)	31s
Docs (windows-2019)	43s
cargo clippy+test (windows-2019)	1m 34s
Docs (ubuntu-latest)	23s
cargo clippy+test (wasm32) (macOS-latest)	57s
cargo clippy+test (ubuntu-latest)	37s
cargo clippy+test (wasm32) (windows-2019)	1m 32s
cargo clippy+test (wasm32) (ubuntu-latest)	32s
	9m 51s

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