Changed some documentation.
- The Runic Altar's entry now has a small preface telling players they should look into Mana Manipulation first.
- The Mana Spreader's entry now has clearer instructions for how the rotating is done and documentation for the fact that you can disable it with a redstone signal.
- The disclaimer that lenses only function when there's a proper block to shoot at has been changed and moved to a single page rather than being on various lenses' pages.