Even more spelling fixes

No functional change.

src/movepick.cpp

@@ -50,7 +50,7 @@ namespace {
   }
 
   // Unary predicate used by std::partition to split positive scores from remaining
-  // ones so to sort separately the two sets, and with the second sort delayed.
+  // ones so as to sort the two sets separately, with the second sort delayed.
   inline bool has_positive_score(const ExtMove& ms) { return ms.score > 0; }
 
   // Picks the best move in the range (begin, end) and moves it to the front.
@@ -65,10 +65,10 @@ namespace {
 
 
 /// Constructors of the MovePicker class. As arguments we pass information
-/// to help it to return the presumably good moves first, to decide which
+/// to help it to return the (presumably) good moves first, to decide which
 /// moves to return (in the quiescence search, for instance, we only want to
-/// search captures, promotions and some checks) and about how important good
-/// move ordering is at the current node.
+/// search captures, promotions and some checks) and how important good move
+/// ordering is at the current node.
 
 MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const HistoryStats& h,
                        Move* cm, Search::Stack* s) : pos(p), history(h), depth(d) {
@@ -286,7 +286,7 @@ void MovePicker::generate_next() {
 /// next_move() is the most important method of the MovePicker class. It returns
 /// a new pseudo legal move every time it is called, until there are no more moves
 /// left. It picks the move with the biggest score from a list of generated moves
-/// taking care not returning the ttMove if has already been searched previously.
+/// taking care not returning the ttMove if it has already been searched previously.
 template<>
 Move MovePicker::next_move<false>() {