Update outdated comments

closes https://github.com/official-stockfish/Stockfish/pull/5158

No functional change

src/position.cpp

@@ -744,7 +744,6 @@ void Position::do_move(Move m, StateInfo& newSt, bool givesCheck) {
         // Update board and piece lists
         remove_piece(capsq);
 
-        // Update material hash key and prefetch access to materialTable
         k ^= Zobrist::psq[captured][capsq];
         st->materialKey ^= Zobrist::psq[captured][pieceCount[captured]];
 

src/search.cpp

@@ -1083,7 +1083,7 @@ moves_loop:  // When in check, search starts here
                     extension = -1;
             }
 
-            // Recapture extensions (~0 Elo on STC, ~1 Elo on LTC)
+            // Extension for capturing the previous moved piece (~0 Elo on STC, ~1 Elo on LTC)
             else if (PvNode && move == ttMove && move.to_sq() == prevSq
                      && thisThread->captureHistory[movedPiece][move.to_sq()]
                                                   [type_of(pos.piece_on(move.to_sq()))]
@@ -1147,7 +1147,7 @@ moves_loop:  // When in check, search starts here
         {
             // In general we want to cap the LMR depth search at newDepth, but when
             // reduction is negative, we allow this move a limited search extension
-            // beyond the first move depth. This may lead to hidden multiple extensions.
+            // beyond the first move depth.
             // To prevent problems when the max value is less than the min value,
             // std::clamp has been replaced by a more robust implementation.
             Depth d = std::max(1, std::min(newDepth - r, newDepth + 1));

src/tt.cpp

@@ -67,7 +67,7 @@ uint8_t TTEntry::relative_age(const uint8_t generation8) const {
 
 
 // Sets the size of the transposition table,
-// measured in megabytes. Transposition table consists of a power of 2 number
+// measured in megabytes. Transposition table consists
 // of clusters and each cluster consists of ClusterSize number of TTEntry.
 void TranspositionTable::resize(size_t mbSize, int threadCount) {
     aligned_large_pages_free(table);