doc: clarify how the bootstrap user name is chosen

Bruce Momjian <bruce@momjian.us>

Commit: 8209605966c330451314fe7899539fa40a4123d1
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-10-10T19:27:26Z
Releases: 17.0
doc:  clarify how the bootstrap user name is chosen

Discussion: https://postgr.es/m/167931662853.3349090.18217722739345182859@wrigleys.postgresql.org

Backpatch-through: 16

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doc/src/sgml/user-manag.sgml modified +3 −4

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