doc: Add missing semicolon in example

One of the examples on the SELECT page was missing a semicolon from
a listing which has the look and feel of being a psql session. This
adds the missing semicolon and also removes the newline between the
query and results to match the other examples nearby.

Backpatch to all supported branches to avoid backpatching issues on
this page.

Reported-by: tim.needh...@gmail.com
Discussion: 
https://postgr.es/m/169965004097.225187.12941375915673151...@wrigleys.postgresql.org
Backpatch-through: v12

Branch
------
REL_13_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/77234f487a0420a88e420459da4fdcda7462ce3a

Modified Files
--------------
doc/src/sgml/ref/select.sgml | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

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