doc: Use system-username instead of system-user

This inconsistency has been introduced in efb6f4a4f9b6.

Reported-by: Julien Rouhaud
Author: Bertrand Drouvot
Discussion: 
https://postgr.es/m/zdmwux1hpiebk...@ip-10-97-1-34.eu-west-3.compute.internal
Backpatch-through: 16

Branch
------
REL_16_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/ec4fcf4a9292378a6a586c7533ef970edf083831

Modified Files
--------------
doc/src/sgml/client-auth.sgml | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

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