doc: Add more ICU rules examples

Peter Eisentraut <peter@eisentraut.org>

Commit: 103df207a71e74d64173edcb7bacec872933755b
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2023-08-23T09:24:43Z
Releases: 16.0
doc: Add more ICU rules examples

In particular, add an example EBCDIC collation.

Author: Daniel Verite <daniel@manitou-mail.org>
Discussion: https://www.postgresql.org/message-id/flat/35cc1684-e516-4a01-a256-351632d47066@manitou-mail.org

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