Doc: fix outdated protocol version.

In the description of StartupMessage, the protocol version was left
3.0. Instead of just updating it, this commit removes the hard coded
protocol version and shows the numbers as an example. This makes that
the part of the doc does not need to be updated when the version is
changed in the future.

Author: Jelte Fennema-Nio <postg...@jeltef.nl>
Reviewed-by: Tatsuo Ishii <is...@postgresql.org>
Reviewed-by: Aleksander Alekseev <aleksan...@timescale.com>
Discussion: 
https://postgr.es/m/20250626.155608.568829483879866256.ishii%40postgresql.org

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/4cff01c4a3472ecd2a53f957f13ab20a2970db4c

Modified Files
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doc/src/sgml/protocol.sgml | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)

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