[DOCS] adduser is missing --system

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Page: https://www.postgresql.org/docs/9.6/static/install-short.html
Description:

Hi,

regarding
https://www.postgresql.org/docs/9.6/static/install-short.html

adduser postgres
should be
adduser --system postgres

otherwise you might face
*PANIC: queueing for lock while waiting on another one

due to systemd Config with RemoveIPC=true

Kind regards,
Jens

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