Apply suggestions from code review

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Vladislav <vladislav.oleshko@gmail.com>

Author: dranikpg

src/server/tiering/serialized_map.cc

@@ -56,7 +56,7 @@ size_t SerializedMap::DataBytes() const {
 }
 
 size_t SerializedMap::EstimateSize(size_t data_bytes, size_t entries) {
-  return kLenBytes /* entry number */ + data_bytes + entries * 2 * kLenBytes /* string lenghts */;
+  return kLenBytes /* entry number */ + data_bytes + entries * 2 * kLenBytes /* string lengths */;
 }
 
 size_t SerializedMap::Serialize(const detail::ListpackWrap& lw, absl::Span<char> buffer) {

src/server/tiering/small_bins.cc

@@ -76,7 +76,7 @@ size_t SmallBins::SerializeBin(FilledBin* bin, io::MutableBytes dest) {
 
   // Steal backing array from bin if relevant
   if (current_bin_.entries.empty()) {
-    bin->entries.erase(bin->entries.begin(), bin->entries.end());  // clear shrinks backing
+    bin->entries.erase(bin->entries.begin(), bin->entries.end());  // erase doesn't shrink backing, so we can reuse the allocated capacity
     current_bin_.entries = std::move(bin->entries);
   }