pgsql: Fix typo in regression test comment - Mailing list pgsql-committers

Fix typo in regression test comment

per Michael Banck

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/4beea5508e80a65a90f3fa857ea34ec71b9d6db2

Modified Files
--------------
src/test/regress/expected/fast_default.out | 2 +-
src/test/regress/sql/fast_default.sql      | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)