DOC Correct minimum adjusted rand index in User Guide (scikit-learn#29410)

Author: MSHelm

doc/modules/clustering.rst

@@ -1370,7 +1370,7 @@ will not necessarily be close to zero.::
   - **Bounded range**: Lower values indicate different labelings, similar
     clusterings have a high (adjusted or unadjusted) Rand index, 1.0 is the
     perfect match score. The score range is [0, 1] for the unadjusted Rand index
-    and [-1, 1] for the adjusted Rand index.
+    and [-0.5, 1] for the adjusted Rand index.
 
   - **No assumption is made on the cluster structure**: The (adjusted or
     unadjusted) Rand index can be used to compare all kinds of clustering
@@ -1444,6 +1444,8 @@ will not necessarily be close to zero.::
   * `Wikipedia entry for the Rand index
     <https://en.wikipedia.org/wiki/Rand_index#Adjusted_Rand_index>`_
 
+  * :doi:`Minimum adjusted Rand index for two clusterings of a given size, 2022, J. E. Chacón and A. I. Rastrojo <10.1007/s11634-022-00491-w>`
+
 
 .. _mutual_info_score: