Repository: Qiskit/qiskit

Issue:
QuantumCircuit initialize() links to StatePreparation and Initialize need fixing
I was looking at the published docs for QuantumCircuit initialize - the links are referring to `extensions` and do not resolve

https://docs.quantum.ibm.com/api/qiskit/qiskit.circuit.QuantumCircuit#initialize

![image](https://github.com/Qiskit/qiskit/assets/40241007/ceab725b-4b6c-453e-8fe4-21d0f632bc55)

which is in `0.45` and `0.46` 

https://github.com/Qiskit/qiskit/blob/f078b64f077a344558cb302ca9621e2ab65ec90b/qiskit/circuit/quantumcircuit.py#L4113-L4117

- [x] Fixed by #11632

In `main` it seems to have been updated but there is a typo in the StatePreparation link - librar`y` is missing the `y` there

https://github.com/Qiskit/qiskit/blob/a7fa6c52a6191034e52ef015378b9fc8cee34a26/qiskit/circuit/quantumcircuit.py#L4562-L4566

- [x] Fixed by #11631


Discussion:
Hi @woodsp-ibm can I be assigned to this issue?
Ah yeah, that was overlooked in #10725, nice catch! @valleyofblackpanther of course, you can have a go at it! 

The links pointing to `qiskit.extensions.<class>` should instead point to `qiskit.circuit.library.<class>`. Let us know if you have any questions. 
Hi, @Cryoris I made the changes but I am unable to push them because Qiskit is not allowing me to do so, do I have to sign the CLA agreement, before pushing it to the main? And who should I send signed document too? 
Hi, you cannot push changes direct into the repository if that is what you are trying to do. Rather you should fork the repo, then make a new branch off the branch to which the changes should apply in your repo, make the changes on that branch in your fork and then do a PR (Pull Request). 

The CLA is online and when doing a PR it will link to this for it to be signed electronically. 

here is more info about these things in this file https://github.com/Qiskit/qiskit/blob/main/CONTRIBUTING.md if you have not seen this.

While the typo (the missing 'y' can be fixed with a PR against main (i,e do the changes in a new branch made from main branch), I think the issue against 0.46 needs to be done against the stable/0.46 branch. There do not seem to be any more releases planned for 0.45 so it maybe 0.46 (which is imminent anyway) is the earliest it can be fixed for, with 1.0 coming a bit later from main. Hopefully @Cryoris can correct me if needed.

Resolving patch:
diff --git a/qiskit/circuit/library/data_preparation/state_preparation.py b/qiskit/circuit/library/data_preparation/state_preparation.py
--- a/qiskit/circuit/library/data_preparation/state_preparation.py
+++ b/qiskit/circuit/library/data_preparation/state_preparation.py
@@ -419,7 +419,7 @@ def prepare_state(self, state, qubits=None, label=None, normalize=False):
     r"""Prepare qubits in a specific state.
 
     This class implements a state preparing unitary. Unlike
-    :class:`qiskit.extensions.Initialize` it does not reset the qubits first.
+    :class:`~qiskit.circuit.library.Initialize` it does not reset the qubits first.
 
     Args:
         state (str or list or int or Statevector):
diff --git a/qiskit/circuit/quantumcircuit.py b/qiskit/circuit/quantumcircuit.py
--- a/qiskit/circuit/quantumcircuit.py
+++ b/qiskit/circuit/quantumcircuit.py
@@ -4116,10 +4116,10 @@ def initialize(
         r"""Initialize qubits in a specific state.
 
         Qubit initialization is done by first resetting the qubits to :math:`|0\rangle`
-        followed by calling :class:`qiskit.extensions.StatePreparation`
+        followed by calling :class:`~qiskit.circuit.library.StatePreparation`
         class to prepare the qubits in a specified state.
         Both these steps are included in the
-        :class:`qiskit.extensions.Initialize` instruction.
+        :class:`~qiskit.circuit.library.Initialize` instruction.
 
         Args:
             params: The state to initialize to, can be either of the following.


Test patch: