Add information about riscv64 support in bash scripts (#41534)

Author: YuliiaKovalova

docs/core/tools/dotnet-install-script.md

@@ -95,7 +95,7 @@ The install scripts do not update the registry on Windows. They just download th
 
 - **`-Architecture|--architecture <ARCHITECTURE>`**
 
-  Architecture of the .NET binaries to install. Possible values are `<auto>`, `amd64`, `x64`, `x86`, `arm64`, `arm`, `s390x`, and `ppc64le`. The default value is `<auto>`, which represents the currently running OS architecture.
+  Architecture of the .NET binaries to install. Possible values are `<auto>`, `amd64`, `x64`, `x86`, `arm64`, `arm`, `s390x`, `ppc64le`, and `riscv64`. The default value is `<auto>`, which represents the currently running OS architecture.
 
 - **`-AzureFeed|--azure-feed`**