Fix typo in _lobpcg.py (pytorch#91641)

represenation -> representation
Pull Request resolved: pytorch#91641
Approved by: https://github.com/zou3519

Author: Ikko Ashimine

torch/_lobpcg.py

@@ -83,7 +83,7 @@ def _polynomial_value(poly, x, zero_power, transition):
 
       x (Tensor): the value (possible batched) to evalate the polynomial `poly` at.
 
-      zero_power (Tensor): the represenation of `x^0`. It is application-specific.
+      zero_power (Tensor): the representation of `x^0`. It is application-specific.
 
       transition (Callable): the function that accepts some intermediate result `int_val`,
                              the `x` and a specific polynomial coefficient