Doc: clarify description of CREATE/ALTER FUNCTION ... SET FROM CURRENT.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: be1d75ea23ee020d0c5e27195a01d7678aa1b5ef
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-08-09T17:39:58Z
Releases: 9.2.19
Doc: clarify description of CREATE/ALTER FUNCTION ... SET FROM CURRENT.

Per discussion with David Johnston.

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