doc: Tiny whitespace fix

Peter Eisentraut <peter_e@gmx.net>

Commit: dd9ed0bf7039eb2b97d9afa198409c0e9798f4ac
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2018-03-05T16:27:08Z
Releases: 11.0
doc: Tiny whitespace fix

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doc/src/sgml/ref/call.sgml modified +1 −1

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