refine comments

common/os.go

@@ -149,8 +149,7 @@ func WriteFileAtomic(filename string, data []byte, perm os.FileMode) error {
 		return io.ErrShortWrite
 	}
 	// Close the file before renaming it, otherwise it will cause "The process 
-	// cannot access the file because it is being used by another process." on windows or 
-	// cause "cross-link error" on linux when you try to save it to another partition.
+	// cannot access the file because it is being used by another process." on windows.
 	f.Close()
 
 	return os.Rename(f.Name(), filename)