Additional doc fixes according to the PR reviews

qiskit_experiments/library/characterization/correlated_readout_error.py

@@ -38,6 +38,11 @@ def calibration_circuit(num_qubits: int, state_label: str) -> QuantumCircuit:
 class CorrelatedReadoutError(BaseExperiment):
     r"""Class for correlated readout error characterization experiment
     # section: overview
+        This class constructs the a :class:`~qiskit.result.CorrelatedReadoutMitigator` containing the full
+        assignment matrix :math:`A` characterizing the readout error for the given qubits
+        from the experiment results accessible via the
+        :meth:`~qiskit.result.CorrelatedReadoutMitigator.assignment_matrix` method.
+
         Readout errors affect quantum computation during the measurement
         of the qubits in a quantum device. By characterizing the readout errors,
         it is possible to construct a *readout error mitigator* that is used both
@@ -52,9 +57,7 @@ class CorrelatedReadoutError(BaseExperiment):
         A *Correlated readout mitigator* uses the full :math:`2^n \times 2^n` assignment matrix, meaning
         it can only be used for small values of :math:`n`.
         The corresponding class in Qiskit is the
-        `Correlated readout mitigator
-        <https://qiskit.org/documentation/stubs/qiskit.result.CorrelatedReadoutMitigator.html>`_
-        in ``qiskit-terra``.
+        :class:`~qiskit.result.CorrelatedReadoutMitigator` in :mod:`qiskit.result`.
 
         The experiment generates :math:`2^n` circuits, for every possible
         :math:`n`-qubit quantum state and constructs

qiskit_experiments/library/characterization/local_readout_error.py

@@ -24,6 +24,12 @@
 class LocalReadoutError(BaseExperiment):
     r"""Class for local readout error characterization experiment
     # section: overview
+
+        This class constructs the a :class:`~qiskit.result.LocalReadoutMitigator` containing sequence
+        of assignment matrices :math:`A` characterizing the readout error for the given qubits
+        from the experiment results. The full assignment matrix is accessible via the
+        :meth:`~qiskit.result.LocalReadoutMitigator.assignment_matrix` method.
+
         Readout errors affect quantum computation during the measurement
         of the qubits in a quantum device. By characterizing the readout errors,
         it is possible to construct a *readout error mitigator* that is used both
@@ -40,9 +46,8 @@ class LocalReadoutError(BaseExperiment):
         In this case, the assignment matrix is the tensor product of :math:`n` :math:`2 \times 2`
         matrices, one for each qubit, making it practical to store the assignment matrix in implicit
         form, by storing the individual :math:`2 \times 2` assignment matrices.
-        The corresponding class in Qiskit is the `Local readout mitigator
-        <https://qiskit.org/documentation/stubs/qiskit.result.LocalReadoutMitigator.html>`_
-        in ``qiskit-terra``.
+        The corresponding class in Qiskit is the :class:`~qiskit.result.LocalReadoutMitigator`
+        in :mod:`qiskit.result`.
 
         The experiment generates 2 circuits, corresponding to the states
         :math:`|0^n\rangle` and :math:`|1^n\rangle`, measuring the error in all the qubits at once, and constructs