Improve Arrow Tip Showcase example in docstring of class ArrowTip (#3297)

Author: teraspora

manim/mobject/geometry/tips.py

@@ -76,23 +76,34 @@ class ArrowTip(VMobject, metaclass=ConvertToOpenGL):
     .. manim:: ArrowTipsShowcase
         :save_last_frame:
 
-        from manim.mobject.geometry.tips import ArrowTriangleTip,\
-                                                ArrowSquareTip, ArrowSquareFilledTip,\
-                                                ArrowCircleTip, ArrowCircleFilledTip
         class ArrowTipsShowcase(Scene):
             def construct(self):
-                a00 = Arrow(start=[-2, 3, 0], end=[2, 3, 0], color=YELLOW)
-                a11 = Arrow(start=[-2, 2, 0], end=[2, 2, 0], tip_shape=ArrowTriangleTip)
-                a12 = Arrow(start=[-2, 1, 0], end=[2, 1, 0])
-                a21 = Arrow(start=[-2, 0, 0], end=[2, 0, 0], tip_shape=ArrowSquareTip)
-                a22 = Arrow([-2, -1, 0], [2, -1, 0], tip_shape=ArrowSquareFilledTip)
-                a31 = Arrow([-2, -2, 0], [2, -2, 0], tip_shape=ArrowCircleTip)
-                a32 = Arrow([-2, -3, 0], [2, -3, 0], tip_shape=ArrowCircleFilledTip)
-                b11 = a11.copy().scale(0.5, scale_tips=True).next_to(a11, RIGHT)
-                b12 = a12.copy().scale(0.5, scale_tips=True).next_to(a12, RIGHT)
-                b21 = a21.copy().scale(0.5, scale_tips=True).next_to(a21, RIGHT)
-                self.add(a00, a11, a12, a21, a22, a31, a32, b11, b12, b21)
-
+                tip_names = [
+                    'Default (YELLOW)', 'ArrowTriangleTip', 'Default', 'ArrowSquareTip',
+                    'ArrowSquareFilledTip', 'ArrowCircleTip', 'ArrowCircleFilledTip', 'StealthTip'
+                ]
+
+                big_arrows = [
+                    Arrow(start=[-4, 3.5, 0], end=[2, 3.5, 0], color=YELLOW),
+                    Arrow(start=[-4, 2.5, 0], end=[2, 2.5, 0], tip_shape=ArrowTriangleTip),
+                    Arrow(start=[-4, 1.5, 0], end=[2, 1.5, 0]),
+                    Arrow(start=[-4, 0.5, 0], end=[2, 0.5, 0], tip_shape=ArrowSquareTip),
+
+                    Arrow([-4, -0.5, 0], [2, -0.5, 0], tip_shape=ArrowSquareFilledTip),
+                    Arrow([-4, -1.5, 0], [2, -1.5, 0], tip_shape=ArrowCircleTip),
+                    Arrow([-4, -2.5, 0], [2, -2.5, 0], tip_shape=ArrowCircleFilledTip),
+                    Arrow([-4, -3.5, 0], [2, -3.5, 0], tip_shape=StealthTip)
+                ]
+
+                small_arrows = (
+                    arrow.copy().scale(0.5, scale_tips=True).next_to(arrow, RIGHT) for arrow in big_arrows
+                )
+
+                labels = (
+                    Text(tip_names[i], font='monospace', font_size=20, color=BLUE).next_to(big_arrows[i], LEFT) for i in range(len(big_arrows))
+                )
+
+                self.add(*big_arrows, *small_arrows, *labels)
     """
 
     def __init__(self, *args, **kwargs):