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doc: adjust DECLARE docs to mention FOR UPDATE behavior

Reported-by: Peter EisentrautDiscussion:https://postgr.es/m/8dc63ba7-dc56-fc7c-fc16-4fae03e3bfe6@2ndquadrant.comAuthor: Peter Eisentraut, Tom Lane, meBackpatch-through: 9.3

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Original file line number	Diff line number	Diff line change
`@@ -271,7 +271,8 @@ DECLARE <replaceable class="parameter">name</replaceable> [ BINARY ] [ INSENSITI`
`271`	`271`	`and not use grouping or <literal>ORDER BY</literal>). Cursors`
`272`	`272`	`that are not simply updatable might work, or might not, depending on plan`
`273`	`273`	`choice details; so in the worst case, an application might work in testing`
`274`		`- and then fail in production.`
	`274`	`+ and then fail in production. If <literal>FOR UPDATE</literal> is`
	`275`	`+ specified, the cursor is guaranteed to be updatable.`
`275`	`276`	`</para>`
`276`	`277`
`277`	`278`	`<para>`

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