Template:S-beltasteroid-stub/doc

The complete list of asteroid-related stub templates is:
 * Asteroid-stub
 * Beltasteroid-stub
 * CentaurTNO-stub
 * C-beltasteroid-stub
 * Jupiter-trojan-stub
 * Mars-crosser-asteroid-stub
 * NE-asteroid-stub
 * S-beltasteroid-stub