Avoid splitting errmsg string to span multiple lines

Amit Langote <amitlan@postgresql.org>

Commit: 085e759e9da77b7f5e859d23f72653f36277a053
Author: Amit Langote <amitlan@postgresql.org>
Date: 2024-03-22T03:04:06Z
Releases: 17.0
Avoid splitting errmsg string to span multiple lines

The error message being fixed was added in 6185c9737c.

While at it, add an "a" to the sentence.

Reported-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Discussion: https://postgr.es/m/20240322.095149.895185546948714852.horikyota.ntt%40gmail.com

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