bug#30660: mention describe-bindings on (info "(emacs) Keymaps")

[Drew Adams]

> (info "(emacs) Keymaps") should mention the best way to view a keymap.
> If the user just uses describe-variable, he will see
>  (67108910 . flyspell-auto-correct-word)
> etc. So mention he should use `describe-bindings'.

`describe-bindings' does not describe the bindings of a given
keymap.

S?he should use `describe-keymap' (`C-h M-k'), from `help-fns+.el'.

It describes the bindings in a keymap in the usual human-readable
way.  You are prompted for a keymap variable (e.g., `ctl-x-map`),
with completion.  (Non-interactively, the argument can be a keymap
itself or a keymap variable.)

This or similar code should be in vanilla Emacs.  (I've offered
any and all of my code.)

https://www.emacswiki.org/emacs/download/help-fns%2b.el