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

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

Commit: 930675867b932efe02a4aba8b639402a2f3d5b9d
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-08-09T17:39:40Z
Releases: 9.5.5
Doc: clarify description of CREATE/ALTER FUNCTION ... SET FROM CURRENT.

Per discussion with David Johnston.

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