doc: Mention the connstring key word for PGSERVICE

Daniel Gustafsson <dgustafsson@postgresql.org>

Commit: 1b4d52c3556b9abad10165ce7298062cf7eb7005
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
Date: 2024-10-01T08:20:14Z
Releases: 18.0
doc: Mention the connstring key word for PGSERVICE

The documentation for the connection service file was mentioning
the environment variable early but not the connection string key
word until the last sentence and only then in an example.  This
adds the keyword in the first paragraph to make it clearer

Author: Dagfinn Ilmari Mannsåker <ilmari@ilmari.org>
Discussion: https://postgr.es/m/87r09ibpke.fsf@wibble.ilmari.org

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