Removed typographical error from tech docs (#51286)

Summary:
Dublications removed from tech docs.

![Screenshot](https://user-images.githubusercontent.com/71665475/106158807-6e5b8100-6184-11eb-9036-bccdf2086c31.png)

Pull Request resolved: #51286

Reviewed By: albanD

Differential Revision: D26227627

Pulled By: ailzhang

fbshipit-source-id: efa0cd90face458673b8530388378d5a7eb0f1cf

torch/functional.py

@@ -1159,7 +1159,7 @@ def atleast_1d(*tensors):
 
 def atleast_2d(*tensors):
     r"""
-    Returns a 2-dimensional view of each each input tensor with zero dimensions.
+    Returns a 2-dimensional view of each input tensor with zero dimensions.
     Input tensors with two or more dimensions are returned as-is.
     Args:
         input (Tensor or list of Tensors)
@@ -1193,7 +1193,7 @@ def atleast_2d(*tensors):
 
 def atleast_3d(*tensors):
     r"""
-    Returns a 3-dimensional view of each each input tensor with zero dimensions.
+    Returns a 3-dimensional view of each input tensor with zero dimensions.
     Input tensors with three or more dimensions are returned as-is.
     Args:
         input (Tensor or list of Tensors)