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doc: clarify recursion internal behavior

Reported-by: Drew DeVaultDiscussion:https://postgr.es/m/20211018091720.31299-1-sir@cmpwn.comBackpatch-through: 10

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Original file line number	Diff line number	Diff line change
`@@ -2110,9 +2110,8 @@ SELECT sum(n) FROM t;`
`2110`	`2110`
`2111`	`2111`	`<note>`
`2112`	`2112`	`<para>`
`2113`		`- Strictly speaking, this process is iteration not recursion, but`
`2114`		`- <literal>RECURSIVE</literal> is the terminology chosen by the SQL standards`
`2115`		`- committee.`
	`2113`	`+ While <literal>RECURSIVE</literal> allows queries to be specified`
	`2114`	`+ recursively, internally all queries are evaluated iteratively.`
`2116`	`2115`	`</para>`
`2117`	`2116`	`</note>`
`2118`	`2117`

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