Clarify config recovery docstring

qiskit_addon_sqd/configuration_recovery.py

@@ -68,8 +68,9 @@ def recover_configurations(
     """
     Refine bitstrings based on average orbital occupancy and a target hamming weight.
 
-    This function makes the assumption that bit ``i`` represents the same orbital as
-    bit ``i + # orbitals`` in all input bitstrings, s.t. ``i < # orbitals``.
+    This function makes the assumption that bit ``i`` represents the spin-down orbital
+    corresponding to the spin-up orbital in bit ``i + N`` where ``N`` is the number of
+    spatial orbitals and ``i < N``.
 
     Args:
         bitstring_matrix: A 2D array of ``bool`` representations of bit