pgsql: docs: fix typo

[Álvaro Herrera]

docs: fix typo

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/48c80aba7538d7c515d0c89f4d11f88974fee851

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