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/[email protected]

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/639924249c8a5e1929a0c74ab4ae15d18683e7fa

Modified Files
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doc/src/sgml/spi.sgml | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

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