bug#61062: 29.0.60; Split Outline Mode node to Outline Minor Mode node

[Juri Linkov <juri@linkov.net>]

close 61062 29.0.60
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>> Another question that I'm not sure about is whether it makes sense to
>> mention all outline-minor-mode supported modes in etc/NEWS?  I mean
>> that we prepared outline-minor-mode related settings in some modes,
>> but not enabled outline-minor-mode in these modes.
>> 
>> For example, we set such values as outline-search-function,
>> outline-level, outline-minor-mode-use-buttons, etc.
>> in apropos-mode and xref.  So the users could easily enable
>> outline-minor-mode in these modes, and it will work
>> without additional customization.
>> 
>> Does it make sense to list these modes in etc/NEWS, so users will know
>> where they can enable outline-minor-mode?  Probably support for
>> apropos-mode could be mentioned under the section Help mode,
>> and outline-minor-mode for xref under the section Xref?
>
> If the list is not too long, I think listing those modes in NEWS would
> be useful.

Done.

>> BTW, it looks like more links could be added to the manual:
>
> Adding cross-references is always a Good Thing, thanks.  The only
> situation where such cross-references could be inappropriate is if
> some prior text in the same node and close enough already has a
> cross-reference to the same place.  In all other cases, such
> cross-references are most welcome.

Also pushed to emacs-29.