bug#40011: Remove unnecessary abbreviations from documentation

[Eli Zaretskii]

> From: Stefan Kangas <stefan@marxist.se>
> Date: Tue, 10 Mar 2020 14:54:25 +0100
> Cc: richard stallman <rms@gnu.org>
> 
> Please consider removing the following acronyms from the
> documentation, both the manual(s) and doc strings:
> 
> 1. no. ("number")
> 2. e.g. ("for example")
> 3. i.e. ("that is", "namely", etc.)
> 4. c.f. ("in contrast to", "compared with", etc.)
> 5. w.r.t. ("with respect to")

Let's not be too extreme: I'm against removing "e.g." and "i.e." at
the least.