pgsql: doc: Fix example with database regexp in HBA documentation

doc: Fix example with database regexp in HBA documentation

This HBA entry was using "local" while specifying an address, which was
incorrect.  While in it, this adjusts the format of the entry to be
aligned with the surroundings.

Oversight in 8fea86830e1d.

Reported-by: Stéphane Schildknecht
Reviewed-by: David G. Johnston
Discussion: https://postgr.es/m/44662001-54c4-4bfd-be93-35e01ca25fa1@gmail.com
Backpatch-through: 16

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/fbff304c574971d15981a080cea8d5a710b81d4d

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