point to correct doc location for new BC function signature.

[ketch]

Resolves clawpack/doc#84.

[coveralls]

Coverage remained the same at 26.56% when pulling e4cf784 on ketch:doc_loc into 44e3ec7 on clawpack:master.

[mandli]

Why is it that the old URL even worked? Do we have a symlink somewhere?

[ketch]

@mandli The old URL is a perfectly valid URL for a page of our docs. It's just the wrong page.

[mandli]

I thought we had removed the doc sub-directory, it is not in the clawpack.github.com repository. Everything referred to in there is also old.

[ketch]

Ah, I see. I think the problem is that we do not overwrite the whole directory structure when we update the docs; we merely write the new/changed files. We should probably clean it by deleting everything and syncing fresh.