Fix some comments

No functional change.

Resolves #123

src/evaluate.cpp

@@ -57,9 +57,8 @@ namespace {
 
     // kingAttackersWeight[color] is the sum of the "weight" of the pieces of the
     // given color which attack a square in the kingRing of the enemy king. The
-    // weights of the individual piece types are given by the variables
-    // QueenAttackWeight, RookAttackWeight, BishopAttackWeight and
-    // KnightAttackWeight in evaluate.cpp
+    // weights of the individual piece types are given by the elements in the
+    // KingAttackWeights array.
     int kingAttackersWeight[COLOR_NB];
 
     // kingAdjacentZoneAttacksCount[color] is the number of attacks to squares

src/material.cpp

@@ -37,7 +37,7 @@ namespace {
     // pair pawn knight bishop rook queen
     {   0                               }, // Bishop pair
     {  39,    2                         }, // Pawn
-    {  35,  271,  -4                    }, // knight      OUR PIECES
+    {  35,  271,  -4                    }, // Knight      OUR PIECES
     {   0,  105,   4,    0              }, // Bishop
     { -27,   -2,  46,   100,  -141      }, // Rook
     {-177,   25, 129,   142,  -137,   0 }  // Queen

src/position.cpp

@@ -1008,7 +1008,7 @@ void Position::undo_null_move() {
 }
 
 
-/// Position::key_after() computes the new hash key after the given moven. Needed
+/// Position::key_after() computes the new hash key after the given move. Needed
 /// for speculative prefetch. It doesn't recognize special moves like castling,
 /// en-passant and promotions.