Update docs/admin/troubleshooting/system-tables.rst

Co-authored-by: Sebastian Utz <[email protected]>

Author: amotl

docs/admin/troubleshooting/system-tables.rst

@@ -224,7 +224,7 @@ the **node** system column that is available for this table. For example,
 this query lists the hosts and tables with the highest number of rows inside
 a single shard::
 
-    cr> SELECT _node['hostname'], table_name, num_docs FROM sys.shards ORDER BY num_docs DESC LIMIT 3;
+    cr> SELECT node['name'], table_name, num_docs FROM sys.shards ORDER BY num_docs DESC LIMIT 3;
     +-------------------...+-----------...-+----------+
     | _node['hostname']    | table_name    | num_docs |
     +-------------------...+------------...+----------+