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doc: change "cross product" to "Cartesian product"

Reported-by: Erik WienholdDiscussion:https://postgr.es/m/2053109544.160895.1684955437950@office.mailbox.orgAuthor: Erik WienholdBackpatch-through: master

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Original file line number	Diff line number	Diff line change
`@@ -392,7 +392,7 @@ FROM <replaceable>table_reference</replaceable> <optional>, <replaceable>table_r`
`392`	`392`	`input tables. As with <literal>USING</literal>, these columns appear`
`393`	`393`	`only once in the output table. If there are no common`
`394`	`394`	`column names, <literal>NATURAL JOIN</literal> behaves like`
`395`		`- <literal>JOIN ... ON TRUE</literal>, producing a cross-product join.`
	`395`	`+ <literal>CROSS JOIN</literal>.`
`396`	`396`	`</para>`
`397`	`397`
`398`	`398`	`<note>`
`@@ -1362,7 +1362,7 @@ GROUPING SETS (`
`1362`	`1362`
`1363`	`1363`	`<para>`
`1364`	`1364`	`If multiple grouping items are specified in a single <literal>GROUP BY</literal>`
`1365`		`- clause, then the final list of grouping sets is thecross product of the`
	`1365`	`+ clause, then the final list of grouping sets is theCartesian product of the`
`1366`	`1366`	`individual items. For example:`
`1367`	`1367`	`<programlisting>`
`1368`	`1368`	`GROUP BY a, CUBE (b, c), GROUPING SETS ((d), (e))`

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