bug#23071: 25.0.90; doc string of `global-eldoc-mode'

[Lars Ingebrigtsen]

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

> This is surely incorrect, according to the code:
>
>  "Enable 'eldoc-mode' in all buffers where it's applicable."
>
> The command `global-eldoc-mode' is a toggle.  It does not _enable_
> `eldoc-mode' in all "applicable" buffers; it toggles whether they are
> enabled.
>
> Also, the doc string should say what it means by "applicable" buffers
> for Eldoc mode.  So far, the doc string is less than helpful - actually
> harmful.

I've now fixed these two things.

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