nixos/postgresql: fix description of ensureUsers.ensurePermissions

`attrName` and `attrValue` are now in correct order.

Changed files
+1 -1
nixos
modules
services
databases
+1 -1
nixos/modules/services/databases/postgresql.nix
···
For more information on how to specify the target
and on which privileges exist, see the
<link xlink:href="https://www.postgresql.org/docs/current/sql-grant.html">GRANT syntax</link>.
-
The attributes are used as <code>GRANT ''${attrName} ON ''${attrValue}</code>.
+
The attributes are used as <code>GRANT ''${attrValue} ON ''${attrName}</code>.
'';
example = literalExample ''
{