bug#7136: Documentation: `completion-in-region-functions' punts to opacity

[Lars Magne Ingebrigtsen]

MON KEY <monkey@sandpframing.com> writes:

> | NEXT-FUN is a function of four arguments (START END COLLECTION PREDICATE)
> | that performs the default operation.  The other four arguments are like
> | the ones passed to `completion-in-region'.
> `----
>
> The punting in the second sentence above (e.g. "The other four") is
> not helpful in the least.  The fourth arg PREDICATE is not documented
> in `completion-in-region'.

I've now documented that argument in `completion-in-region'.

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