Fix an error message to contain the correct directive name

[jajik]

There is a typo/error in the error message: for -> before.

[jajik]

Thanks for the review

[rhusar]

Interestingly enough, the https://docs.modcluster.io/legacy/ mention the old variant but https://docs.modcluster.io/#waitbeforeremove is correct. So perhaps not just a typo but that's what it was called?

[jfclere]

@rhusar do you want to support both version? or assume we are good?

[jajik]

I've just quickly scanned the repo (the original one) and it seems the directive was always WaitBeforeRemove (from 1.2.x) and that the docs were simply wrong. At least that's how it looks like.

[rhusar]

@rhusar do you want to support both version? or assume we are good?

We are good, so no, we don't need/want to support the wrong version since that has never worked.

[rhusar]

I've just quickly scanned the repo (the original one) and it seems the directive was always WaitBeforeRemove (from 1.2.x) and that the docs were simply wrong. At least that's how it looks like.

Did the same search today with same conclusion ;-)