Update color.py

Author: kolibril13

manim/utils/color.py

@@ -104,8 +104,9 @@ class Colors(Enum):
 
     .. code-block:: python
 
-       import manim.utils.color as C
-       C.WHITE   # -> '#FFFFFF'
+        >>> import manim.utils.color as C
+        >>> C.WHITE   
+        '#FFFFFF'
 
     Note this way uses the name of the colors in UPPERCASE.