doc: add missing <returnvalue> and whitespace

Amit Langote <amitlan@postgresql.org>

Commit: e055b6be7ebb0de35570102327717c99d91fe540
Author: Amit Langote <amitlan@postgresql.org>
Date: 2023-07-28T07:05:44Z
Releases: 17.0
doc: add missing <returnvalue> and whitespace

Missed in commit 03734a7fed.

Author: Shinoda, Noriyoshi <noriyoshi.shinoda@hpe.com>
Discussion: https://postgr.es/m/DM4PR84MB1734E58BB4DC0E1B6E2990EBEE01A%40DM4PR84MB1734.NAMPRD84.PROD.OUTLOOK.COM

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doc/src/sgml/func.sgml modified +4 −3

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