fix: typo in function name

Author: realstealthninja

physics/ground_to_ground_projectile_motion.cpp

@@ -31,7 +31,7 @@ namespace ground_to_ground_projectile_motion {
  * @returns Angle in degrees
  */
 
-double degree_to_radians(double degree){
+double degrees_to_radians(double degree){
     double radians = degree * (M_PI / 180);
     return radians;
 }