Reformat some comments

Also include the bench to make Continuation Integration happy on Github.

Bench: 1603079

src/search.cpp

@@ -928,7 +928,8 @@ namespace {
     moveCountPruning = singularQuietLMR = false;
 
     // Indicate PvNodes that will probably fail low if the node was searched
-    // at a depth equal to or greater than the current depth, and the result of this search was a fail low.
+    // at a depth equal to or greater than the current depth, and the result
+    // of this search was a fail low.
     bool likelyFailLow =    PvNode
                          && ttMove
                          && (tte->bound() & BOUND_UPPER)
@@ -1039,10 +1040,10 @@ namespace {
           // Singular extension search (~94 Elo). If all moves but one fail low on a
           // search of (alpha-s, beta-s), and just one fails high on (alpha, beta),
           // then that move is singular and should be extended. To verify this we do
-          // a reduced search on all the other moves but the ttMove and if the
-          // result is lower than ttValue minus a margin, then we will extend the ttMove.
-          // Depth margin and singularBeta margin are known for having non-linear scaling.
-          // Their values are optimized to time controls of 180+1.8 and longer
+          // a reduced search on all the other moves but the ttMove and if the result
+          // is lower than ttValue minus a margin, then we will extend the ttMove. Note
+          // that depth margin and singularBeta margin are known for having non-linear
+          // scaling. Their values are optimized to time controls of 180+1.8 and longer
           // so changing them requires tests at this type of time controls.
           if (   !rootNode
               &&  depth >= 4 - (thisThread->completedDepth > 22) + 2 * (PvNode && tte->is_pv())
@@ -1076,10 +1077,10 @@ namespace {
               }
 
               // Multi-cut pruning
-              // Our ttMove is assumed to fail high, and now we failed high also on a reduced
-              // search without the ttMove. So we assume this expected Cut-node is not singular,
-              // that multiple moves fail high, and we can prune the whole subtree by returning
-              // a softbound.
+              // Our ttMove is assumed to fail high, and now we failed high also on a
+              // reduced search without the ttMove. So we assume this expected cut-node
+              // is not singular, that multiple moves fail high, and we can prune the
+              // whole subtree by returning a softbound.
               else if (singularBeta >= beta)
                   return singularBeta;
 
@@ -1126,8 +1127,7 @@ namespace {
       // Step 16. Make the move
       pos.do_move(move, st, givesCheck);
 
-      // Decrease reduction if position is or has been on the PV
-      // and node is not likely to fail low. (~3 Elo)
+      // Decrease reduction if position is or has been on the PV and not likely to fail low. (~3 Elo)
       // Decrease further on cutNodes. (~1 Elo)
       if (   ss->ttPv
           && !likelyFailLow)
@@ -1162,6 +1162,7 @@ namespace {
       if ((ss+1)->cutoffCnt > 3)
           r++;
 
+      // Decrease reduction for first generated move (ttMove)
       else if (move == ttMove)
           r--;