doc: Remove line breaks after <title>

Peter Eisentraut <peter@eisentraut.org>

Commit: ab5b55505ec4bf08a9f93810e1bfada93bc63bb5
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2020-06-07T11:12:08Z
Releases: 13.0
doc: Remove line breaks after <title>

This creates unnecessary rendering problem risks, and it's
inconsistent and gets copied around.

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