bug#50759: 26.3; Add `Look Up Symbol (Code Name) in Manual' to Help > Search Documentation menu

[Juri Linkov]

> Enhancement request.
>
> Please consider adding a menu item for `C-h S' (`info-lookup-symbol') to
> the Help > Search Documentation menu-bar menu.
>
> The menu-item name is up to you.  Using "Symbol" in the name has
> advantages and disadvantages.  Disadvantage: it likely won't be clear to
> some what's meant.  Advantage: trying it is a good way to discover what
> "symbol" means for Emacs.

It can be copied from the recently added elisp-context-menu.