Variable referencing itself in example of pgbench.sgml

Hi all,

While looking at some recent commit related to pgbench I noticed this
example in the docs:
\set aid (1021 * :aid) % (100000 * :scale) + 1
This actually would fail because aid references itself.

Attached is a patch to change this example as follows:
-\set aid (1021 * :aid) % (100000 * :scale) + 1
+\set aid (1021 * :ntellers) % (100000 * :scale) + 1
Regards,
--
Michael