doc: add pg_prewarm example

Bruce Momjian <bruce@momjian.us>

Commit: aa31b29375b9afbe1330d7726855645ff82a2e51
Author: Bruce Momjian <bruce@momjian.us>
Date: 2022-07-08T22:36:27Z
Releases: 16.0
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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