docs: Add missing Since annotation
@@ -911,6 +911,8 @@ graphene_euler_to_matrix (const graphene_euler_t *e,
* @res: (out caller-allocates): return location for a #graphene_quaternion_t
*
* Converts a #graphene_euler_t into a #graphene_quaternion_t.
+ *
+ * Since: 1.10
*/
void
graphene_euler_to_quaternion (const graphene_euler_t *e,
