doc: add pg_prewarm example

Bruce Momjian <bruce@momjian.us>

Commit: 12f56b6a70ca06acd394f37a965e4814e8472373
Author: Bruce Momjian <bruce@momjian.us>
Date: 2022-07-08T22:36:27Z
Releases: 13.8
doc:  add pg_prewarm example

Discussion: https://postgr.es/m/20220618085541.ezxdaljlpo6x7msc@home-desktop

Author: Dong Wook Lee

Backpatch-through: 11

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doc/src/sgml/pgprewarm.sgml modified +13 −0

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