Cleanup comments

Tests used to derive some Elo worth comments:
https://tests.stockfishchess.org/tests/view/656a7f4e136acbc573555a31
https://tests.stockfishchess.org/tests/view/6585fb455457644dc984620f

closes https://github.com/official-stockfish/Stockfish/pull/4945

No functional change

src/nnue/layers/sqr_clipped_relu.h

@@ -91,7 +91,7 @@ class SqrClippedReLU {
         for (IndexType i = Start; i < InputDimensions; ++i)
         {
             output[i] = static_cast<OutputType>(
-              // Really should be /127 but we need to make it fast so we right shift
+              // Really should be /127 but we need to make it fast so we right-shift
               // by an extra 7 bits instead. Needs to be accounted for in the trainer.
               std::min(127ll, ((long long) (input[i]) * input[i]) >> (2 * WeightScaleBits + 7)));
         }