Doc: Update example symptom of systemd misconfiguration.

Thomas Munro <tmunro@postgresql.org>

Commit: b944b1d1a9ac4a08b790833522d5edd165f740d1
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2020-06-08T01:21:50Z
Releases: 12.4
Doc: Update example symptom of systemd misconfiguration.

In PostgreSQL 10, we stopped using System V semaphores on Linux
systems.  Update the example we give of an error message from a
misconfigured system to show what people are most likely to see these
days.

Back-patch to 10, where PREFERRED_SEMAPHORES=UNNAMED_POSIX arrived.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CA%2BhUKGLmJUSwybaPQv39rB8ABpqJq84im2UjZvyUY4feYhpWMw%40mail.gmail.com

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doc/src/sgml/runtime.sgml modified +6 −5

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