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/syzygy/tbprobe.cpp

@@ -1317,7 +1317,7 @@ WDLScore search(Position& pos, ProbeState* result) {
 }  // namespace
 
 
-// Tablebases::init() is called at startup and after every change to
+// Called at startup and after every change to
 // "SyzygyPath" UCI option to (re)create the various tables. It is not thread
 // safe, nor it needs to be.
 void Tablebases::init(const std::string& paths) {