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Clarify documentation for the initcap function

Alexander Korotkov <akorotkov@postgresql.org>

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Commit: 276b022ec05bbd5a9639fa71e1197d53bac20075
Author: Alexander Korotkov <akorotkov@postgresql.org>
Date: 2025-07-29T07:43:40Z
Releases: 14.19 
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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