fix: Typos in Timestamp (facebookincubator#11830)

Summary: Pull Request resolved: facebookincubator#11830

Reviewed By: xiaoxmeng

Differential Revision: D67186249

Pulled By: zacw7

fbshipit-source-id: a1e0f45f899677f402d8f09fdccf1857fff4b4d9

velox/type/Timestamp.h

@@ -156,11 +156,11 @@ struct Timestamp {
 
   // Keep it in header for getting inlined.
   int64_t toMillis() const {
-    // We use int128_t to make sure the computation does not overflows since
+    // We use int128_t to make sure the computation does not overflow since
     // there are cases such that seconds*1000 does not fit in int64_t,
     // but seconds*1000 + nanos does, an example is TimeStamp::minMillis().
 
-    // If the final result does not fit in int64_tw we throw.
+    // If the final result does not fit in int64_t we throw.
     __int128_t result =
         (__int128_t)seconds_ * 1'000 + (int64_t)(nanos_ / 1'000'000);
     if (result < std::numeric_limits<int64_t>::min() ||