update_engine: typo

Fix typo

Test: th
Change-Id: I8db583dc27a7206d2ef8dc3365bd085e7f27fc26
diff --git a/payload_consumer/block_extent_writer.h b/payload_consumer/block_extent_writer.h
index eeae36d..516c24b 100644
--- a/payload_consumer/block_extent_writer.h
+++ b/payload_consumer/block_extent_writer.h
@@ -49,7 +49,7 @@
   bool NextExtent();
   [[nodiscard]] size_t ConsumeWithBuffer(const uint8_t* const bytes,
                                          const size_t count);
-  // It's a non-owning pointer, because PartitionWriter owns the CowWruter. This
+  // It's a non-owning pointer, because PartitionWriter owns the CowWriter. This
   // allows us to use a single instance of CowWriter for all operations applied
   // to the same partition.
   google::protobuf::RepeatedPtrField<Extent> extents_;