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doc: Improve tableoid description

Mention that it's useful for determining table names for partitionedtables as well as for those in inheritance hierarchies.Author: Ian Lawrence Barwick <barwick@gmail.com>Reviewed-by: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com>Discussion:https://www.postgresql.org/message-id/flat/CAB8KJ=gFmBXP=P9htziOj+WM5PDAK4qc7iGQta+8kUh306kQnw@mail.gmail.com

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Original file line number	Diff line number	Diff line change
`@@ -1144,7 +1144,8 @@ CREATE TABLE circles (`
`1144`	`1144`
`1145`	`1145`	`<para>`
`1146`	`1146`	`The OID of the table containing this row. This column is`
`1147`		`- particularly handy for queries that select from inheritance`
	`1147`	`+ particularly handy for queries that select from partitioned`
	`1148`	`+ tables (see <xref linkend="ddl-partitioning"/>) or inheritance`
`1148`	`1149`	`hierarchies (see <xref linkend="ddl-inherit"/>), since without it,`
`1149`	`1150`	`it's difficult to tell which individual table a row came from. The`
`1150`	`1151`	`<structfield>tableoid</structfield> can be joined against the`

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