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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REL_10_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/4aad9813e8040ea8ad7a149ee5724ee3631c6d55

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

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