pgsql: doc: Remove superfluous bracket in synopsis

doc: Remove superfluous bracket in synopsis

Commit 9c08aea6a30 accidentally added one too many end brackets
in the synopsis for CREATE DATABASE .. strategy = strat. Fix by
removing. Backpatch to v15 where it was introduced.

Reported-by: tim.needham2@gmail.com
Discussion: https://postgr.es/m/170734160862.3279712.810853722572951776@wrigleys.postgresql.org
Backpatch-through: v15

Branch
------
REL_16_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/e13205a5e4ad0fb75110a25f81654511303566f8

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