bug#8678: 24.0.50; `isearch-barrier' referred to in doc string, but it has no doc itself

[Lars Magne Ingebrigtsen]

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

> At the very least, a doc string is needed for `isearch-barrier', because
> it is referred to in the doc string of `isearch-fallback'.  IOW, we are
> using it to explain something else, yet it is an unknown.

I almost removed the mention from the doc string of `isearch-fallback'
instead, since it seemed pretty irrelevant.

But I added a doc string to the variable instead.

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