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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
`@@ -2172,9 +2172,8 @@ SELECT sum(n) FROM t;`
`2172`	`2172`
`2173`	`2173`	`<note>`
`2174`	`2174`	`<para>`
`2175`		`- Strictly speaking, this process is iteration not recursion, but`
`2176`		`- <literal>RECURSIVE</literal> is the terminology chosen by the SQL standards`
`2177`		`- committee.`
	`2175`	`+ While <literal>RECURSIVE</literal> allows queries to be specified`
	`2176`	`+ recursively, internally all queries are evaluated iteratively.`
`2178`	`2177`	`</para>`
`2179`	`2178`	`</note>`
`2180`	`2179`

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