doc: Remove unused ids

Peter Eisentraut <peter@eisentraut.org>

Commit: 7e39b968f118c6444bd3a3bd59c3e9d73e652e0c
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2020-03-07T13:04:09Z
Releases: 13.0
doc: Remove unused ids

Some reference pages contained id attributes on refname elements.
These were apparently copied around from ancient times, but they don't
serve a purpose.  FOP issues minor warnings about them.  So it's
easiest to just remove them.

Files

Documentation touched