Add reno

releasenotes/notes/irb-circuit-order-619845a707519c44.yaml

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+---
+features:
+  - |
+    A new experiment option ``circuit_order`` was added to ``~.InterleavedRB`.
+    It allows to change the order of the reference and the interleaved circuits
+    and hence slightly alter the impact of noise on interleaved RB results.
+    The default value is set to ``"RIRIRI"`` that alternate a reference and
+    an interleaved circuit.
+fixes:
+  - |
+    Changed the ordering of circuits generated by ``~.InterleavedRB` back to
+    RIRIRI (R: Reference, I: Interleaved) order.
+    It was accidentally changed into RRRIII order in
+    `#898 <https://github.com/Qiskit/qiskit-experiments/pull/898>`_.
+    Before that, it had been RIRIRI order.