pgsql: doc: Update error messages in RLS examples

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 -- REL_11_STABLE Details ---

pgsql: doc: Update error messages in RLS examples

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 -- REL_12_STABLE Details ---

pgsql: doc: Update error messages in RLS examples

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 -- REL_13_STABLE Details ---

pgsql: doc: Update error messages in RLS examples

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 -- REL_14_STABLE Details ---

pgsql: doc: Update error messages in RLS examples

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 -- REL_15_STABLE Details ---

pgsql: doc: Update error messages in RLS examples

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 -- master Details ---