pgsql: Improve wording of error message added in commit 714805010.

Improve wording of error message added in commit 714805010.

Per suggestions from Peter Eisentraut and David Johnston.
Back-patch, like the previous commit.

Discussion: /messages/by-id/E1dv9jI-0006oT-Fn@gemulon.postgresql.org

Branch
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REL9_4_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/14f94ac697cf6b70d939a1263d79d32a3362760b

Modified Files
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src/backend/commands/analyze.c | 2 +-
src/test/regress/expected/vacuum.out | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)

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