bug#22336: 25.0.50; cl-generic.el features are not documented in ELisp manual

[Eli Zaretskii]

> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Sat, 23 Jan 2016 08:29:50 +0300
> 
> On 01/23/2016 12:17 AM, Eli Zaretskii wrote:
> 
> > Since so many people volunteered that I had trouble picking up the
> > best one, I did this myself in commit 849a314.
> 
> Thank you, Eli. I gave it a once-over, and it's a good read.

Thanks for reviewing.  Getting all that stuff together was a
non-trivial feat.

Note that the doc strings don't tell everything I wrote, and sometimes
seem to say inaccurate or even contradictory things, so if what I
wrote correctly describes what the implementation actually does, the
doc strings (as well as some of the comments) in cl-generic.el should
probably be brought in line with the reality.