Fix doctests in factorial_recursive function (#13703)

* Fix doctests in factorial_recursive function

The doctests in factorial_recursive were calling factorial() instead of factorial_recursive(). This fix ensures that the tests correctly validate the factorial_recursive function itself.

* Update factorial.py

---------

Co-authored-by: Maxim Smolskiy <mithridatus@mail.ru>

maths/factorial.py

@@ -41,21 +41,21 @@ def factorial_recursive(n: int) -> int:
     https://en.wikipedia.org/wiki/Factorial
 
     >>> import math
-    >>> all(factorial(i) == math.factorial(i) for i in range(20))
+    >>> all(factorial_recursive(i) == math.factorial(i) for i in range(20))
     True
-    >>> factorial(0.1)
+    >>> factorial_recursive(0.1)
     Traceback (most recent call last):
         ...
-    ValueError: factorial() only accepts integral values
-    >>> factorial(-1)
+    ValueError: factorial_recursive() only accepts integral values
+    >>> factorial_recursive(-1)
     Traceback (most recent call last):
         ...
-    ValueError: factorial() not defined for negative values
+    ValueError: factorial_recursive() not defined for negative values
     """
     if not isinstance(n, int):
-        raise ValueError("factorial() only accepts integral values")
+        raise ValueError("factorial_recursive() only accepts integral values")
     if n < 0:
-        raise ValueError("factorial() not defined for negative values")
+        raise ValueError("factorial_recursive() not defined for negative values")
     return 1 if n in {0, 1} else n * factorial_recursive(n - 1)