Commitc38cadc

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Doc: trivial wording adjustment.

Improve self-referential foreign key example, per suggestionfrom David Johnston.Discussion:https://postgr.es/m/CAKFQuwZTke7+HUn4YUGqu2+gAPi4Cy18TXMrg_Z5nADkxfPNMw@mail.gmail.com

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Original file line number	Diff line number	Diff line change
`@@ -956,7 +956,7 @@ CREATE TABLE tree (`
`956`	`956`	`);`
`957`	`957`	`</programlisting>`
`958`	`958`	`A top-level node would have NULL <structfield>parent_id</structfield>,`
`959`		`-but non-NULL <structfield>parent_id</structfield> entries would be`
	`959`	`+while non-NULL <structfield>parent_id</structfield> entries would be`
`960`	`960`	`constrained to reference valid rows of the table.`
`961`	`961`	`</para>`
`962`	`962`

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