bug#67734: 30.0.50; Don't mention `set` in the ELisp intro

[Stefan Monnier]

>> The ELisp intro needs to be updated to the world of static scoping.
>> I haven't really looked at doing that, but the patch below can be
>> considered as a step in that direction.
>> In any case, I think it's a good change on its own.
>>
>> It removes all mentions of the `set` function.
>> `set` cannot be used on statically scoped variables and I can't see what
>> it brings to the reader of the ELisp intro (except maybe for explaining
>> the "q" in `setq`) to first tell them about `set` only to turn around
>> and tell them they'll never use it.
>>
>> Suggestions for improvements welcome,
>
> LGTM.  If it's worth doing, it should be worth doing also on emacs-29,
> I think.

I'm fine with `emacs-29`, yes.

> Is it worth reflowing the paragraphs before installing though?

Will do.


        Stefan