Merge pull request #3491 from 522848942/patch-1

Update core.rst

Author: alejoe91

doc/modules/core.rst

@@ -385,7 +385,7 @@ and merging unit groups.
 
     sorting_analyzer_select = sorting_analyzer.select_units(unit_ids=[0, 1, 2, 3])
     sorting_analyzer_remove = sorting_analyzer.remove_units(remove_unit_ids=[0])
-    sorting_analyzer_merge = sorting_analyzer.merge_units([0, 1], [2, 3])
+    sorting_analyzer_merge = sorting_analyzer.merge_units([[0, 1], [2, 3]])
 
 All computed extensions will be automatically propagated or merged when curating. Please refer to the
 :ref:`modules/curation:Curation module` documentation for more information.