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Clarify documentation for the initcap function

Alexander Korotkov <akorotkov@postgresql.org>

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Commit: 3c05d4d3433e1bd4097f39fed2a9398cb2e662db
Author: Alexander Korotkov <akorotkov@postgresql.org>
Date: 2025-07-29T07:43:35Z
Releases: 17.6 
Clarify documentation for the initcap function

This commit documents differences in the definition of word separators for
the initcap function between libc and ICU locale providers.
Backpatch to all supported branches.

Discussion: https://postgr.es/m/804cc10ef95d4d3b298e76b181fd9437%40postgrespro.ru
Author: Oleg Tselebrovskiy <o.tselebrovskiy@postgrespro.ru>
Backpatch-through: 13

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doc/src/sgml/func.sgml modified +5 −2

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