qapi: Drop "with an explanation" from error descriptions

All errors come with an explanation, namely the human-readable error
message in the error response's @desc member.  Drop the redundant
"with an explanation" phrase.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240911132459.2548063-2-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
1 file changed