Update the IQPE class docstring
* Update IQPE class docstring
Clears a grammatical error in the docstring for IQPE class.
* Update iqpe.py
# This code is part of Qiskit.
#
-# (C) Copyright IBM 2018, 2020.
+# (C) Copyright IBM 2018, 2021.
#
# This code is licensed under the Apache License, Version 2.0. You may
# obtain a copy of this license in the LICENSE.txt file in the root directory
@@ -45,7 +45,7 @@ class IQPE(QuantumAlgorithm, MinimumEigensolver):
"""The Iterative Quantum Phase Estimation algorithm.
IQPE, as its name suggests, iteratively computes the phase so as to require fewer qubits.
- It takes has the same set of parameters as :class:`QPE`, except for the number of
+ It has the same set of parameters as :class:`QPE`, except for the number of
ancillary qubits *num_ancillae*, being replaced by *num_iterations* and that
an Inverse Quantum Fourier Transform (IQFT) is not used for IQPE.
