Broken links in DEPLOY.rst

These links are broken on GitHub:

To configure destinations, create a configuration file according to ./docs/source/man_sbws.ini.rst (or /docs/source/man_sbws.ini.rst or :doc:`man_sbws.ini` or man sbws.ini)

https://github.com/torproject/sbws/blob/master/DEPLOY.rst#scanner-setup

We should fix this before sbws is deployed by more operators.