bug#66946: 30.0.50; Elisp manual section 17.4 describes an obsolete variable

[Stefan Kangas]

Ihor Radchenko <yantar92@posteo.net> writes:

> In Elisp manual, "17.4 Dynamic Loading of Individual Functions"
> describes `byte-compile-dynamic' variable.
>
> However, according to the docstring, this variable is no longer useful
>
>     byte-compile-dynamic is a variable defined in bytecomp.el.
>
>     This variable is obsolete since 27.1; not worthwhile any more.
>
>     Value
>     nil
>
> It looks like the corresponding section of the manual is now obsolete
> and should probably be removed.

The manual says:

       _Experience shows that using dynamic function loading provides
    benefits that are hardly measurable, so this feature is deprecated
    since Emacs 27.1._

Stefan M, any comments here?  Is it time to actually mark this stuff
obsolete?