Added detailed instructions for moving torrent contents.

Reason: I found out the hard way that it can take a lot of trial and error to successfully move torrent contents from their initial download location, as there are several factors to consider, including some basic understanding of the difference between torrent content that is a folder and the download location of that folder (the fact that Set Download Location starts one level too deep doesn't help). I have attempted to write a more detailed explanation of the content-moving procedure in a way that would have helped me immensely. Please consider incorporating these changes into the documentation.

In order to satisfy your formatting conventions, I used unordered lists, even though I prefer ordered lists for sequential procedures. And I consistently used the exclusively plural term "torrent contents" instead of the more versatile "torrent content" or just "content". Had I been able to use "content", it would make it simpler and more natural, such as when saying the "content is" (not "contents are") a single file/folder, or when saying what to do if the content name has changed.