doc: Make UPDATE FROM examples consistent

Daniel Gustafsson <dgustafsson@postgresql.org>

Commit: 3785d8e98b741749d09f1cfe119ec04961ed07b2
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
Date: 2022-03-29T12:53:20Z
Releases: 15.0
doc: Make UPDATE FROM examples consistent

The original first half of the example used an employees table and an
accounts.sales_person foreign key column, while the second half (added
in commit 8f889b1083f) used a salesmen table and accounts.sales_id
for the foreign key.  This makes everything use the original names.

Author: Dagfinn Ilmari Mannsåker <ilmari@ilmari.org>
Discussion: https://postgr.es/m/87o81vqjw0.fsf@wibble.ilmari.org

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