Alexander Korotkov f8ce9ed220 Further clarify documentation for the initcap function
This is a follow-up for commit c2c2c7e225.  It further clarifies the
following in the initcap function documentation:

 * Document that title case is used for digraphs in specific locales,
 * Reference particular ICU function used,
 * Add note about the purpose of the function.

Discussion: https://postgr.es/m/804cc10ef95d4d3b298e76b181fd9437%40postgrespro.ru
Author: Oleg Tselebrovskiy <o.tselebrovskiy@postgrespro.ru>
Co-authored-by: Alexander Korotkov <aekorotkov@gmail.com>
Reviewed-by: Jeff Davis <pgsql@j-davis.com>
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
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PostgreSQL Database Management System

This directory contains the source code distribution of the PostgreSQL database management system.

PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.

Copyright and license information can be found in the file COPYRIGHT.

General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.

The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.

Description
he World's Most Advanced Open Source Relational Database.
Readme 776 MiB
Languages
C 84.9%
PLpgSQL 6.1%
Perl 4.6%
Yacc 1.2%
Meson 0.7%
Other 2.2%