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Doc: Update notes about libc collation versions.

Thomas Munro <tmunro@postgresql.org>

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Commit: b65431ca5e12a475ba7cf68afb63edb070c2ce08
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2021-05-07T09:58:02Z
Releases: 14.0 
Doc: Update notes about libc collation versions.

The per-index collation version tracking feature was reverted, but we
still have the ability to ask Windows (352f6f2d) and FreeBSD
(ca051d8b) for collation versions to store in pg_collation.collversion.
So, from the reverted patch, take a few words of documentation about
libc on all three supported OSes to replace the pre-existing note that
mentioned only glibc.

Discussion: https://postgr.es/m/CA%2BhUKGLhj5t1fcjqAu8iD9B3ixJtsTNqyCCD4V0aTO9kAKAjjA%40mail.gmail.com

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doc/src/sgml/ref/alter_collation.sgml modified +17 −5

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