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 <ilm...@ilmari.org>
Discussion: https://postgr.es/m/87r09ibpke....@wibble.ilmari.org

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/1b4d52c3556b9abad10165ce7298062cf7eb7005

Modified Files
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doc/src/sgml/libpq.sgml | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

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