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Explain COALESCE example in the docs.

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Original file line number	Diff line number	Diff line change
`@@ -10015,6 +10015,8 @@ SELECT ... WHERE CASE WHEN x <> 0 THEN y/x > 1.5 ELSE false END;`
`10015`	`10015`	`<programlisting>`
`10016`	`10016`	`SELECT COALESCE(description, short_description, '(none)') ...`
`10017`	`10017`	`</programlisting>`
	`10018`	`+ This returns <varname>description</> if it is not null, or`
	`10019`	`+ <varname>short_description</> if it is not null, or <literal>(none)</>.`
`10018`	`10020`	`</para>`
`10019`	`10021`
`10020`	`10022`	`<para>`

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