bug#21225: 25.0.50; doc strings of `define-obsolete-*'

[Lars Ingebrigtsen]

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

> Argument WHEN is not described at all for some of these macros.  For
> others it is described incorrectly or only via an example.  It needs to
> be described clearly.
>
> The correct description is, in all cases, what is said in the Elisp
> manual for `make-obsolete':
>
>    If provided, WHEN should be a string indicating when the function
>    was first made obsolete=81\for example, a date or a release number.
>
> (with "function" replaced by "face" or "variable", as appropriate),
> except that "version number" is preferable to "release number".

I've now done so.

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