#417 Better text for newbies, fix typos, better exit location

[rock808]

Fixed a few typos, updated some text to make things more clear for newbies, moved a msg from waybread to magic mouth where it belongs, set exit to beginners_entry rather than beginners as a better entry point to the game.

[Nicolas Weeger]

Committed as 63f942df8f2601b295013a03423cbfeabb1fde3d, thanks!