Doc: fix minor typo in func.sgml.

Discussion: 
https://postgr.es/m/20191119.222048.49467220816510881.t-ishii%40sraoss.co.jp

Branch
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REL_12_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/135026653d450c28d458576a023dffc0e3cb0bf9

Modified Files
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doc/src/sgml/func.sgml | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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