bug#51883: 29.0.50; Command to get accidentally deleted frames back

[Juri Linkov]

> A detail: I find this:
>
> | modified   etc/NEWS
> | +The most recently deleted frame can be undeleted with 'C-x 5 u' when
> | +the new user option 'undelete-frame-max' has its default value 1.
>
> slightly confusing: any positive value will suffice to undelete the most
> recently deleted frame.  Maybe say instead "...if the new user option
> 'undelete-frame-max' is enabled.  The option specifies the maximum
> number of closed frames to remember.  The default is 1." or something
> like that?

Thanks for the suggestion, now changed with a better wording.