fix CLOSE ref page

Patch applied. Thanks.

---------------------------------------------------------------------------

Neil Conway wrote:

There is a misstatement in the CLOSE reference page, now that we
have cursors that might outlive their creating transactions. A
patch is attached that fixes this (suggestions on better wording
are welcome).

-Neil

[ Attachment, skipping... ]

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TIP 7: don't forget to increase your free space map settings

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