doc: fix another case of missing productname markup

As a follow-up commit to 0f85db92b9, this adds <productname> markup
to another case of "PostgreSQL".

Author: Hayato Kuroda <kuroda.hay...@fujitsu.com>
Discussion: 
https://postgr.es/m/tyapr01mb58667a7c8317e267467cc599f5...@tyapr01mb5866.jpnprd01.prod.outlook.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/eb2618a03c53695532eaad680522c60dca0d4061

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

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