Update python docstring

Author: tadeja

python/pyarrow/_compute.pyx

@@ -1466,9 +1466,9 @@ class InversePermutationOptions(_InversePermutationOptions):
         minus 1 and the length of the function’s output will be the length
         of the input indices.
     output_type : DataType, default None
-        The type of the output inverse permutation.
+        The data type for the output array of inverse permutation.
         If None, the output will be of the same type as the input indices, otherwise
-        must be signed integer type. An invalid error will be reported if this type
+        must be a signed integer type. An invalid error will be reported if this type
         is not able to store the length of the input indices.
     """