remove blank line between function and it's description

- remove the blank line between the declaration of the function and it's
  comment, leads to better IDE support when hovering over a function to see it's
  description
- remove the unnecessary duplication of the function name in the functions
  description
- slightly refactored code for lsb, msb in bitboard.h There are still a few
  things we can be improved later on, move the description of a function where
  it was declared (instead of implemented) and add descriptions to functions
  which are behind macros ifdefs

closes https://github.com/official-stockfish/Stockfish/pull/4840

No functional change

src/movegen.cpp

@@ -241,7 +241,6 @@ ExtMove* generate_all(const Position& pos, ExtMove* moveList) {
 //                except castling and promotions
 //
 // Returns a pointer to the end of the move list.
-
 template<GenType Type>
 ExtMove* generate(const Position& pos, ExtMove* moveList) {