Heya!

Intrigued by tab-bar-select-restore-windows's docstring:

> Function called when selecting a tab to handle windows whose buffer was killed.
> When a tab-bar tab displays a window whose buffer was killed since
> this tab was last selected, this function determines what to do with
> that window.  By default, either a random buffer is displayed instead of
                ^^^^^^^^^^
> the killed buffer, or the window gets deleted.  However, with the help
> of ‘window-restore-killed-buffer-windows’ it’s possible to handle such
> situations better by displaying an information about the killed buffer.

Over here, 'emacs -Q' suggests that _by default_, this option is set to
the eponymous symbol 'tab-bar-select-restore-windows'.  So the default
behaviour that I observe, when coming back to a tab that used to show a
killed buffer, is a special-mode buffer named " *Old buffer foo*" saying
"This window displayed the buffer ‘foo’."

Based on the NEWS entry, I guess the effective default behaviour is the
one intended?  In which case, I'm attaching a suggested rewording of the
docstring, based on understanding gleaned from cross-referencing the
NEWS entry, the docstrings for set-window-configuration,
window-restore-killed-buffer-windows, the corresponding manual entries,
and the source for set-window-configuration.

I am not 100% sure I succeeded in capturing the state of things, so feel
free to dismiss the patch; my main goal was to make it easier for Past
Me to get an answer to the question: "How do I get the previous
behaviour back"?

(Rationale FWIW: IME killing buffers is deliberate, so the placeholder
buffer feels redundant, i.e. it brings no information; if I am
displeased with whatever random buffer was picked to show in that
window, I can just switch to another buffer or delete the window)