doc: Fix generated column documentation

Peter Eisentraut <peter@eisentraut.org>

Commit: 00ef6e3b28a8220f2dba881dbf56e3ba62f851bd
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2019-05-27T16:26:16Z
Releases: 12.0
doc: Fix generated column documentation

The old text still had an implicit reference to the virtual behavior,
which was not in the final patch.

Author: Tobias Bussmann <t.bussmann@gmx.net>

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