BF: fix billboard_sphere function name

Author: m-agour

fury/actor/billboard.py

@@ -7,7 +7,7 @@
 
 from __future__ import annotations
 
-__all__ = ["billboard", "create_billboard_sphere", "Billboard"]
+__all__ = ["billboard", "billboard_sphere", "Billboard"]
 
 import numpy as np
 
@@ -171,7 +171,7 @@ def billboard(
     )
 
 
-def create_billboard_sphere(
+def billboard_sphere(
     centers,
     *,
     colors=(1, 1, 1),