Remove incorrect statement from docs

Column that is in the USING clause is not required to be present in the column
list of the left side of the join (but it must be present in the table definition).

This reverts commit f2533a96.

docs/en/query_language/select.md

@@ -346,42 +346,6 @@ The table name can be specified instead of a subquery. This is equivalent to the
 
 All columns that are not needed for the JOIN are deleted from the subquery.
 
-Example:
-
-``` sql
-SELECT
-    endpoint,
-    metric,
-    value,
-    idcName
-FROM datapoints
-ALL INNER JOIN
-(
-    SELECT
-        ips AS endpoint,
-        idcName
-    FROM cmdb
-) USING (endpoint)
-LIMIT 10
-```
-
-```
-┌─endpoint─────┬─metric────────────┬───────value─┬─idcName─┐
-│ 192.168.1.100 │ disk.total        │ 50465866000 │ office  │
-│ 192.168.1.100 │ disk.total        │   494927870 │ office  │
-│ 192.168.1.100 │ disk.used.percent │          48 │ office  │
-│ 192.168.1.100 │ disk.used.percent │          50 │ office  │
-│ 192.168.1.100 │ disk.util         │           0 │ office  │
-│ 192.168.1.100 │ disk.util         │           0 │ office  │
-│ 192.168.1.100 │ disk.util         │           0 │ office  │
-│ 192.168.1.100 │ disk.util         │           0 │ office  │
-│ 192.168.1.100 │ load.15min        │        0.02 │ office  │
-│ 192.168.1.100 │ load.1min         │        0.11 │ office  │
-└──────────────┴───────────────────┴─────────────┴─────────┘
-```
-
-Notice the column in `USING`(endpoint) must be in former `SELECT` column list and subquery's.
-
 There are several types of JOINs:
 
 `INNER` or `LEFT` type:If INNER is specified, the result will contain only those rows that have a matching row in the right table.