doc: Better example for custom ICU rules

Peter Eisentraut <peter@eisentraut.org>

Commit: cd427859745af4574d75e37ec7d427ccd2b8b24a
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2023-03-10T08:25:03Z
Releases: 16.0
doc: Better example for custom ICU rules

Use a more practical example, and also add some explanation.

Reported-by: Jeff Davis <pgsql@j-davis.com>

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doc/src/sgml/ref/create_collation.sgml modified +9 −3

Documentation touched