Doc: fix incorrect example of collecting arguments with fmgr macros.

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

Commit: c9a1c55a8b342cd00ffa810dfa63620ce6d497da
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2018-12-19T16:02:07Z
Releases: 11.2
Doc: fix incorrect example of collecting arguments with fmgr macros.

Thinko in commit f66912b0a.  Back-patch to v10, as that was.

Discussion: https://postgr.es/m/154522283371.15419.15167411691473730460@wrigleys.postgresql.org

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doc/src/sgml/spi.sgml modified +4 −3

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