Rename the CI `cargo fmt` job to `formatting`. #692

Job	Run time
cargo check (msrv) (wasm32)	24s
cargo check (msrv) (windows-latest)	1m 7s
cargo clippy (wasm32)	38s
cargo check (msrv) (macos-latest)	31s
cargo clippy (windows-latest)	1m 25s
cargo check (msrv) (ubuntu-latest)	23s
cargo doc	19s
cargo clippy (macos-latest)	41s
formatting	22s
cargo clippy (ubuntu-latest)	42s
cargo test (wasm32)	22s
cargo test (windows-latest)	1m 4s
typos	5s
cargo test (macos-latest)	25s
cargo test (ubuntu-latest)	19s
	8m 47s

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