Remove references to non-existent functions CM_MarkFragments and CM_LerpTag.

code/qcommon/q_shared.h

@@ -1007,7 +1007,7 @@ typedef struct {
 // or ENTITYNUM_NONE, ENTITYNUM_WORLD
 
 
-// markfragments are returned by CM_MarkFragments()
+// markfragments are returned by R_MarkFragments()
 typedef struct {
 	int		firstPoint;
 	int		numPoints;