news: Add a mention of RISC-V guest support
news: Add a mention of RISC-V guest support

Signed-off-by: Lubomir Rintel <c9b9bbc6e9b0bc7e9cec5af1551c7b98adb9530c@v3.sk>
Reviewed-by: Andrea Bolognani <3ada0bee826c753786fdbba72243dfba997094cf@redhat.com>

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