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

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

Commit: e4b4a469441d7028ae73279481b28375b74ee3dc
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-08-09T17:39:53Z
Releases: 9.3.15
Doc: clarify description of CREATE/ALTER FUNCTION ... SET FROM CURRENT.

Per discussion with David Johnston.

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