[README] fix some formatting on the top level
[README] fix some formatting on the top level

Guess I need to read the docs on this particular flavor of markup.
littlekernel/lk,hollanderic/lkstuff,littlekernel/lk,hollanderic/lkstuff,littlekernel/lk,hollanderic/lkstuff,hollanderic/lkstuff,littlekernel/lk