What does moderate narrowing C7-T1 disk space with mild subchondral bony sclerosis and mild posterior spurring mean?

The gap between two of the vertebrae in the spine just between your shoulder blades has become narrowed, perhaps compressing on the spinal cord and causing pain/tingling sensation in your body (at a guess). There are signs of osteoarthritis in the vertebrae, as shown by areas of patchy whiteness where the bone has been damaged and regenerated and some abnormal bony spurs forming.