It means that there is mild arthritic changes. The cervical endplates are the bottoms of the cervical (neck) of the vertebrae in the spine. So there are spurring, or the protrusion of calcified bone at the endplate between cervical spine 4 and 5. Spurring is a form of osteoarthritis.
If you look at the picture below, you can see two views of the cervical spine. In one picture, you see a blue, irregular disc - this disc is between each vertebrae. Below is the vertebrae. You can see how the vertebrae come together - on the end of one of the vertebrae, at the end of the c-4, there is minimal spurring, so there is some extra formation of calcified deposit on the end of the bone that affects the intervertebral space between C-4 and C-5.
If you look at figure 1, on the last vertebrae, near where it says "Fig. 1", that bottom vertebrae flairs out a little bit - which is normal. If there was exaggerated flaring out on either ends of the vertebrae, it could be considered a spur formation if there are calcified deposits present.
You didn't mention if the spurring is occurring posteriorally (back) or anteriorally (front) or the conditions of the discs or if there is anything pressing on the spinal cord.
If you have any further questions regarding this topic, please let me know.