Minor JSON-schema adjustments. #1040

Job	Run time
clients_TypeScript_npm (ubuntu-20.04, schema)	1m 5s
clients_TypeScript_npm (ubuntu-20.04, client)	1m 5s
clients_TypeScript_npm (ubuntu-20.04, repl)	54s
clients_TypeScript_repl (ubuntu-20.04, linux)	1m 26s
clients_TypeScript_repl (ubuntu-20.04, macos)	1m 12s
clients_TypeScript_repl (ubuntu-20.04, win.exe)	1m 7s
server_lint (ubuntu-20.04)	21s
server_build (linux, x86_64, ghc8107)	1h 0m 9s
docker (linux, ogmios, mainnet, 8.1.1, 8.1.2, x86_64)	40s
docker (linux, ogmios, mainnet, 8.1.2, 8.1.2, x86_64)	50s
docker (linux, ogmios, preprod, 8.1.1, 8.1.2, x86_64)	19s
docker (linux, ogmios, preprod, 8.1.2, 8.1.2, x86_64)	25s
docker (linux, ogmios, preview, 8.1.1, 8.1.2, x86_64)	30s
docker (linux, ogmios, preview, 8.1.2, 8.1.2, x86_64)	18s
docker (linux, cardano-node-ogmios, mainnet, 8.1.1, 8.1.2, x86_64)	1m 5s
docker (linux, cardano-node-ogmios, mainnet, 8.1.2, 8.1.2, x86_64)	1m 11s
docker (linux, cardano-node-ogmios, preprod, 8.1.1, 8.1.2, x86_64)	59s
docker (linux, cardano-node-ogmios, preprod, 8.1.2, 8.1.2, x86_64)	1m 3s
docker (linux, cardano-node-ogmios, preview, 8.1.1, 8.1.2, x86_64)	48s
docker (linux, cardano-node-ogmios, preview, 8.1.2, 8.1.2, x86_64)	56s
	1h 16m 23s

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