doc: Update note about source code formatting

Peter Eisentraut <peter@eisentraut.org>

Commit: b4d615aaa1ecedcf1e2ca415cd2893d1f18aeeca
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2019-09-26T08:52:19Z
Releases: 12.0
doc: Update note about source code formatting

Update the note about why not to use // comments, even though it's now
technically supported.

The note about variable declarations was dropped here because it's
addressed more properly later in the chapter.

Discussion: https://www.postgresql.org/message-id/flat/156924954640.1117.6309209869705522549%40wrigleys.postgresql.org

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