Followup fixes to the qpu-information page (#3918)

Closes #3904 

cc: @dcmckayibm @marcolincs

---------

Co-authored-by: Marco Facchini <[email protected]>

Author: abbycross

docs/guides/qpu-information.mdx

@@ -96,7 +96,7 @@ The total number of jobs that you have submitted to this QPU.
 
 ### Median 2Q error (Heron: CZ, Eagle: ECR)
 
-[Average gate fidelity](/docs/api/qiskit/quantum_info#average_gate_fidelity) of the two-qubit operation from randomized benchmarking. Measured in "isolation": batches with a minimum separation of two qubits between edges. This randomized benchmarking uses alternating layers of single-qubit Cliffords and two-qubit gates, and thus the final 2Q error value includes the error of the layer of single-qubit Cliffords. Find an [example notebook](https://github.com/qiskit-community/qiskit-device-benchmarking/blob/main/notebooks/device_rb_w_lf.ipynb) in the Qiskit Community GitHub.
+[Average gate fidelity](/docs/api/qiskit/quantum_info#average_gate_fidelity) of the two-qubit operation from randomized benchmarking. Measured in "isolation": batches with a minimum separation of two qubits between edges. This randomized benchmarking uses alternating layers of single-qubit Cliffords and two-qubit gates, and thus the final 2Q error value includes the error of the layer of single-qubit Cliffords. Find an [example notebook](https://github.com/qiskit-community/qiskit-device-benchmarking/blob/main/notebooks/device_rb_w_lf.ipynb) in the Qiskit Community GitHub. Find per-edge data in the [calibration data](#calibration-data) section of the QPU information card.
 
 ### Median SX error
 
@@ -128,7 +128,7 @@ To download calibration data as a CSV file, click the download icon in the upper
 
 In addition to the information provided in the Details section of the card, the Calibration data section also includes the following:
 
-[Topology diagram or coupling map](#coupling-map) | [Readout assignment error](#readout-assignment-error) | [Prob meas0 prep1](#prob-meas0-prep1) | [Prob meas1 prep0](#prob-meas1-prep0) | [Readout length (ns)](#readout-length-ns) | [ID error / √x (sx) error / Pauli-X error](#finite-duration-discrete) | [Single-qubit gate length (ns)](#single-qubit-gate-length-ns) | [RX error](#rx-error) | [Z-axis rotation (RZ) error](#z-axis-rotation-rz-error) | [Operational](#operational) | [Gate length (ns)](#gate-length-ns) | [2Q error](#2q-error) | [RZZ error](#rzz-error-heron)
+[Topology diagram or coupling map](#coupling-map) | [Readout assignment error](#readout-assignment-error) | [Prob meas0 prep1](#prob-meas0-prep1) | [Prob meas1 prep0](#prob-meas1-prep0) | [Readout length (ns)](#readout-length-ns) | [ID error / √x (sx) error / Pauli-X error / RX error](#finite-duration-discrete) | [Single-qubit gate length (ns)](#single-qubit-gate-length-ns)| [Z-axis rotation (RZ) error](#z-axis-rotation-rz-error) | [Operational](#operational) | [Gate length (ns)](#gate-length-ns) | [2Q error](#2q-error) | [RZZ error](#rzz-error-heron)
 
 <span id="coupling-map"></span>
 ### Topology diagram or coupling map
@@ -152,18 +152,14 @@ Similarly, this parameter represents the probability of measuring a qubit in the
 The readout_length specifies the duration of the readout operation for a qubit. It measures the time from the initiation of the measurement pulse to the completion of signal digitization, after which the system is ready for the next operation. Understanding this parameter is crucial for optimizing circuit execution, especially when incorporating mid-circuit measurements.
 
 <span id="finite-duration-discrete"></span>
-### ID error / √x (sx) error / Pauli-X error
+### ID error / √x (sx) error / Pauli-X error / RX error
 
-Error in the finite-duration discrete one-qubit gates, measured from randomized benchmarking. The randomized benchmarking sequence includes SX, ID, and X gates, and it is assumed their errors are the same. The ID gate is a delay of duration equal to the duration of the √X and X gates.
+Error in the finite-duration discrete one-qubit gates, measured from randomized benchmarking. The randomized benchmarking sequence includes SX, ID, and X gates, and it is assumed their errors are the same. The ID gate is a delay of duration equal to the duration of the √X and X gates. The RX gate is also the same duration as the √X and X gates with variable amplitude, and so it is reported as having the same error as these gates.
 
 ### Single-qubit gate length (ns)
 
 Duration of a single-qubit gate operation.
 
-### RX error
-
-Error in the RX gate, averaged over the RX angles using a variant of randomized benchmarking.
-
 ### Z-axis rotation (RZ) error
 
 Error in the virtual RZ gate. Reported as all 0 since these are performed in software.
@@ -179,7 +175,7 @@ Duration of the two-qubit gate operation.
 <span id="2q-error"></span>
 ### 2Q error (Heron: CZ, Eagle: ECR)
 
-Error in the 2Q gate averaged over the 2Q angles using a variant of randomized benchmarking for arbitrary unitaries.
+The 2Q error per edge from the same batch of measurements used to calculate the [2Q median](#median-2q-error-heron-cz-eagle-ecr) and [2Q best](#2q-error-best) errors.
 
 ### RZZ error (Heron)