bug#42050: 27.0.91; Clarify Info-next docstring

[Eli Zaretskii]

> Cc: eliz@gnu.org,uyennhi.qm@gmail.com
> From: Tino Calancha <tino.calancha@gmail.com>
> Date: Thu, 25 Jun 2020 23:43:42 +0200
> 
> When I am reading a section of the Emacs manual, then I
> often assume that `p' and `n' behavior is like when you are
> reading a book, i.e. jump to the prev/next page; i.e., my
> natural expectation is that `n' is bound to `Info-forward-node'.
> 
> I think their docstrings could add some
> description and mention to the other existent command.
> 
> You get my point in this patch:

Thanks, I fixed this in a slightly different way.

P.S. Do you really use [ and ] in Info when reading a manual?