fix: Update array method type signatures in the docs #2907

Job	Run time
build-nargo	2m 24s
build-acvm-js	4m 21s
build-noirc-abi	4m 27s
ACVM JS (Browser)	1m 34s
ACVM JS (Node.js)	35s
build-noir-wasm	2m 24s
Noir JS	1m 36s
noir-js-backend-barretenberg	42s
noirc_abi	1m 0s
noir_codegen	1m 0s
noir_wasm	1m 10s
Integration Tests	9m 30s
End	1s
	30m 44s

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