doc: use wording "restore" instead of "reload" of dumps

Bruce Momjian <bruce@momjian.us>

Commit: d5623c447c743cce3913559a353451711b6fa2f4
Author: Bruce Momjian <bruce@momjian.us>
Date: 2022-07-21T18:55:23Z
Releases: 15.0
doc:  use wording "restore" instead of "reload" of dumps

Reported-by: axel.kluener@gmail.com

Discussion: https://postgr.es/m/164736074430.660.3645615289283943146@wrigleys.postgresql.org

Backpatch-through: 11

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Documentation touched