doc: Update error messages in RLS examples

Since 8b9e9644d, the messages for failed permissions checks report
"table" where appropriate, rather than "relation".

Backpatch to all supported branches

Branch
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REL_15_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/f5d60b1ea2156ecd42c6ccd4284f715763abf8f8

Modified Files
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doc/src/sgml/ddl.sgml | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

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