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In commit baf86d6b3c we switched the default trace backend from "nop" to "log". Update the documentation to match. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 1478276837-31780-1-git-send-email-peter.maydell@linaro.org Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>