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doc: improve description of subscripting of arrays

It wasn't clear the non-integers are cast to integers for subscripting,rather than throwing an error.Reported-by: sean@materialize.ioDiscussion:https://postgr.es/m/159538675800.624.7728794628229799531@wrigleys.postgresql.orgBackpatch-through: 9.5

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Original file line number	Diff line number	Diff line change
`@@ -1383,7 +1383,7 @@ CREATE FUNCTION dept(text) RETURNS dept`
`1383`	`1383`	`</synopsis>`
`1384`	`1384`	`(Here, the brackets <literal>[ ]</literal> are meant to appear literally.)`
`1385`	`1385`	`Each <replaceable>subscript</replaceable> is itself an expression,`
`1386`		`- whichmust yield an integer value.`
	`1386`	`+ whichwill be rounded to the nearest integer value.`
`1387`	`1387`	`</para>`
`1388`	`1388`
`1389`	`1389`	`<para>`

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