added typings and docs for vectorized mobjects and bezier related functions (#961)

* added typings and docs for vectorized mobjects and bezier related functions

* woops fixed mistake

* fixed tests and run black

* Merge branch 'added-docs-deep-functions' of github.com:huguesdevimeux/manim into added-docs-deep-functions

* applied @leotrs suggestion

* run black

* Update manim/mobject/geometry.py

Co-authored-by: Leo Torres <[email protected]>

Co-authored-by: Hugues Devimeux <[email protected]>
Co-authored-by: kolibril13 <[email protected]>
Co-authored-by: Leo Torres <[email protected]>

Author: 4 people

manim/mobject/geometry.py

@@ -919,6 +919,7 @@ def __init__(self, points, **kwargs):
 class Polygon(VMobject):
     def __init__(self, *vertices, color=BLUE, **kwargs):
         VMobject.__init__(self, color=color, **kwargs)
+        # There are actually four corners, and the first one is repeated twice to form the four vertices.
         self.set_points_as_corners([*vertices, vertices[0]])
 
     def get_vertices(self):