"Editing Basics" first pass

I have more documentation/screenshots to add (covering things like the "Page" menu when editing a specific page, adding content/plugins, etc.) but this at least gets rid of the "TODOs" in the docs.
Not necessarily. It provides an additional, alternative, title for the page, and *if* the developer chooses to make use of it in the <title> attribute, it will be used by browsers (in title bars, bookmarks, web history, and so on) and by search engines when they list pages.