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Nathan Bossart 964152c476 doc: Reorganize section for shared memory and LWLocks.
Presently, this section meanders through a few different features,
and the text itself is terse.  This commit attempts to improve
matters by splitting the section into smaller sections and by
expanding the text for clarity.  This is preparatory work for a
follow-up commit that will introduce a way for libraries to use
shared memory without needing to request it at startup time.

Reviewed-by: Aleksander Alekseev, Bharath Rupireddy, Abhijit Menon-Sen
Discussion: https://postgr.es/m/20240112041430.GA3557928%40nathanxps13
Discussion: https://postgr.es/m/20231205034647.GA2705267%40nathanxps13
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README

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/.