Simplify hazmat feature docs (#1643) #337

Job	Run time
collect-examples	17s
test-example (events)	2m 37s
test-example (cross_contract/contract_a)	2m 40s
test-example (increment_with_pause)	2m 57s
test-example (mint-lock)	2m 33s
test-example (cross_contract/contract_b)	2m 55s
test-example (import_ark_bn254)	2m 42s
test-example (increment_with_fuzz)	3m 37s
test-example (bls_signature)	2m 31s
test-example (atomic_multiswap)	3m 1s
test-example (custom_types)	2m 39s
test-example (privacy-pools)	3m 29s
test-example (privacy-pools/contract)	37s
test-example (pause)	2m 38s
test-example (atomic_swap)	2m 37s
test-example (deployer/contract)	2m 40s
test-example (other_custom_types)	2m 37s
test-example (fuzzing)	3m 50s
test-example (deployer/deployer)	2m 55s
test-example (timelock)	2m 34s
test-example (token)	2m 29s
test-example (increment)	3m 5s
test-example (groth16_verifier)	2m 31s
test-example (account)	2m 45s
test-example (logging)	2m 33s
test-example (merkle_distribution)	2m 44s
test-example (single_offer)	2m 26s
test-example (upgradeable_contract/new_contract)	2m 29s
test-example (eth_abi)	2m 44s
test-example (simple_account)	2m 37s
test-example (errors)	3m 12s
test-example (deep_contract_auth)	2m 37s
test-example (hello_world)	2m 26s
test-example (upgradeable_contract/old_contract)	3m 0s
test-example (liquidity_pool)	2m 33s
test-example (ttl)	2m 42s
test-example (alloc)	2m 33s
test-example (auth)	2m 38s
test-example (multisig_1_of_n_account/contract)	3m 5s
	1h 43m 35s

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