docs: Link to the correct protocol version inspection function

The docs for max_protocol_version suggested PQprotocolVersion()
instead of PQfullProtocolVersion() to find out the exact protocol
version.  Since PQprotocolVersion() only returns the major protocol
version, that is bad advice.

Author: Jelte Fennema-Nio <[email protected]>
Reviewed-by: Shinya Kato <[email protected]>
Discussion: 
https://www.postgresql.org/message-id/flat/CAGECzQSKFxQsYAgr11PhdOr-RtPZEdAXZnHx6U3avLuk3xQaTQ%40mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/9fcd4874ed50ee6c60dadd0f1146d8fea9ff0055

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

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