The documentation has not been updated to include the new way to set storage serialization.
UseJsonFormat no longer exists. dotnet/orleans#8383 (comment)

Document Details

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• ID: eb892ec8-fbbc-9d3b-b84a-ed1d870ed3f9
• Version Independent ID: 3a311967-0163-2594-02a1-7d6863571e14
• Content: ADO.NET grain persistence
• Content Source: docs/orleans/grains/grain-persistence/relational-storage.md
• Product: dotnet-orleans
• GitHub Login: @IEvangelist
• Microsoft Alias: dapine