update docstring in bloch

dptb/negf/bloch.py

@@ -1,11 +1,19 @@
-
 import numpy as np
 
 
 # The Bloch class in Python defines a method to unfold k points based on a given Bloch factor.
 class Bloch(object):
 
     def __init__(self,bloch_factor) -> None:
+        '''This Python function initializes an object with a Bloch factor represented as a 3D vector.
+        
+        Parameters
+        ----------
+        bloch_factor
+            It is expected to be a list or numpy array representing a 3D vector to expand the provided
+         k points.
+        
+        '''
 
         if  isinstance(bloch_factor,list):
             bloch_factor = np.array(bloch_factor)
@@ -26,8 +34,7 @@ def unfold_points(self,k:list) -> np.ndarray:
         Returns
         -------
             The `unfold_points` method returns a reshaped array of expansion points calculated based on the
-        input parameter `k` and the bloch factor `B`. The expansion points are created using B-casting rules
-        and then reshaped into a 2D array with 3 columns.
+        input parameter `k` and the bloch factor `B`.
         
         '''