MAINT: numpy dev docs have external link, add comment, cleanup

[mattip]

continuation of numpy/numpy#10844

Also added a comment how to add new releases, and fixed a dangling <span> or two

Edit: formatting

[scopatz]

Looks like this has a conflict now

[mattip]

fixed

[scopatz]

Thanks @mattip!

[mattip]

Thanks for merging. Any idea when this goes live? I am still seeing the old page

[scopatz]

No idea. probably should be using something like doctr here

[pv]

Hi, please don't merge PRs to this repository if you cannot update the result (this is not automated).

[scopatz]

Hi @pv - happy to build and push up the docs. I just looked for instructions and couldn't find any, other than make html. How would I upload the docs once they are built?

[rgommers]

This requires SSH access to an Enthought-owned server that runs docs.scipy.org. I'll push it up tonight.

[scopatz]

Thanks @rgommers!