Fix a typo

Fix a typo in bytes.go

common/stack/bytes.go

@@ -1,6 +1,6 @@
 package stack
 
-// TwoBytes is a [8]byte which is always allocated on stack.
+// TwoBytes is a [2]byte which is always allocated on stack.
 //
 //go:notinheap
 type TwoBytes [2]byte