doc: libpq connection options can override command-line flags

Bruce Momjian <bruce@momjian.us>

Commit: 65aa18e85a0557e68d0e7464cc2ea8d417f3e577
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-10-03T02:19:30Z
Releases: 10.15
doc:  libpq connection options can override command-line flags

Reported-by: Alexander Lakhin

Discussion: https://postgr.es/m/16486-b9c93d71c02c4907@postgresql.org

Backpatch-through: 9.5

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