Update deprecated.md

Add empty line to make linter happy?

fsharp/deprecated.md

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-These images have been removed in favor of the [official .NET SDK image](https://hub.docker.com/_/microsoft-dotnet-sdk/), provided and maintained by Microsoft.
+These images have been removed in favor of the [official .NET SDK image](https://hub.docker.com/_/microsoft-dotnet-sdk/), provided and maintained by Microsoft.