bug#18024: 24.4.50; doc of `y-or-n-p' misses the main functionality: what it returns

[Lars Ingebrigtsen]

Drew Adams <drew.adams@oracle.com> writes:

> 1. `y-or-n-p' is a *predicate*.  This is missing from the doc string,
> because it says nothing about what the function returns if the user
> answers `n' instead of `y'.  The doc string *must* tell users that `n'
> means return nil.

I've now changed the doc string to say what the "n" value is.

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