Revert "Add doctests for cross function. Contributes to TheAlgorithms#9943 (TheAlgorithms#12991)"

This reverts commit c0ad5bb.

Author: omaroot

data_structures/arrays/sudoku_solver.py

@@ -11,19 +11,6 @@
 def cross(items_a, items_b):
     """
     Cross product of elements in A and elements in B.
-
-    >>> cross('AB', '12')
-    ['A1', 'A2', 'B1', 'B2']
-    >>> cross('ABC', '123')
-    ['A1', 'A2', 'A3', 'B1', 'B2', 'B3', 'C1', 'C2', 'C3']
-    >>> cross('ABC', '1234')
-    ['A1', 'A2', 'A3', 'A4', 'B1', 'B2', 'B3', 'B4', 'C1', 'C2', 'C3', 'C4']
-    >>> cross('', '12')
-    []
-    >>> cross('A', '')
-    []
-    >>> cross('', '')
-    []
     """
     return [a + b for a in items_a for b in items_b]