Fix typo from HSV PR (#3887)

Author: JasonGrace2282

manim/utils/color/core.py

@@ -634,7 +634,7 @@ def into(self, classtype: type[ManimColorT]) -> ManimColorT:
 
         Returns
         -------
-        __INTO
+        ManimColorT
             Color object of the type passed into classtype with the same internal value as previously
         """
         return classtype._from_internal(self._internal_value)