timer: update comments
The comments is outdated. The patch has following changes: 1. tense correction. 2. all clock time value is returned in nanoseconds, so, they are same in precision. 3. virtual clock doesn't use cpu cycles. Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: NCao jin <caoj.fnst@cn.fujitsu.com> Message-Id: <1469790338-28990-2-git-send-email-caoj.fnst@cn.fujitsu.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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