bug#12282: 24.1.50; `font-lock-value-in-major-mode': doc string and parameter name

[Lars Ingebrigtsen]

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

> The parameter should be renamed.  It is an alist associating major modes
> with font-lock decoration levels OR it is such a level.
>
> The current doc and parameter name give the impression that the argument
> passed is typically an alist.  But in practice (existing code in Emacs
> distribution, as well as existing 3rd-party code), it is more often a
> decoration level (including `t' for max decoration) that is passed as
> argument.
>
> Just saying that the return value is ALIST if ALIST is not an alist,
> while certainly correct, is being less clear than we could be.

Fixed on trunk.

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