doc: Consistently use = sign in long options synopses

Peter Eisentraut <peter_e@gmx.net>

Commit: c709c6074083a8cc5f1ba431c741ff04e3a8a906
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2016-10-19T12:48:48Z
Releases: 10.0
doc: Consistently use = sign in long options synopses

This was already the predominant form in man pages and help output.

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