fix(docs): remove duplicate typo (#3111) #6559

Job	Run time
Format + check + test	26m 54s
cargo-deny aarch64-apple-darwin	2m 0s
cargo-deny aarch64-linux-android	2m 8s
cargo-deny i686-pc-windows-gnu	1m 50s
cargo-deny i686-pc-windows-msvc	2m 0s
cargo-deny i686-unknown-linux-gnu	2m 25s
cargo-deny wasm32-unknown-unknown	1m 51s
cargo-deny x86_64-apple-darwin	1m 56s
cargo-deny x86_64-pc-windows-gnu	2m 17s
cargo-deny x86_64-pc-windows-msvc	2m 4s
cargo-deny x86_64-unknown-linux-gnu	1m 52s
cargo-deny x86_64-unknown-linux-musl	1m 48s
cargo-deny x86_64-unknown-redox	2m 16s
Check wasm32 + wasm-bindgen	8m 50s
android	3m 9s
Check Windows	10m 26s
	1h 13m 46s

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