Update docs for metadata (#719) #344

Job	Run time
1155 Contracts / coverage / Coverage	1m 33s
1155 Contracts / build / Build	26s
1155 Deployments / build / Build	3m 44s
ERC20Z Contracts / build / Build	26s
ERC20Z Contracts / coverage / Coverage	3m 15s
Protocol Rewards / build / Build	28s
Protocol Rewards / coverage / Coverage	2m 18s
Sparks / build / Build	25s
Sparks / coverage / Coverage	50s
Sparks Deployments / build / Build	26s
ERC20Z Contracts / contract_sizes / Contract sizes	36s
ERC20Z Contracts / slither / Slither	57s
ERC20Z Contracts / storage_layout / Storage layout inspection	29s
ERC20Z Contracts / test / Test	1m 21s
1155 Contracts / slither / Slither	1m 18s
1155 Contracts / test / Test	30s
1155 Contracts / contract_sizes / Contract sizes	28s
1155 Contracts / storage_layout / Storage layout inspection	31s
Sparks Deployments / test / Test	31s
Sparks / storage_layout	0s
Sparks / contract_sizes / Contract sizes	37s
Sparks / slither / Slither	51s
Sparks / test / Test	39s
Protocol Rewards / storage_layout	0s
Protocol Rewards / test / Test	55s
Protocol Rewards / contract_sizes / Contract sizes	27s
Protocol Rewards / slither / Slither	53s
1155 Deployments / test / Test	4m 30s
	29m 24s

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