update hamming_distance.md

`list()` is not required since `str` itself has `count()`

snippets/hamming_distance.md

@@ -7,11 +7,11 @@ Calculates the Hamming distance between two values.
 
 - Use the XOR operator (`^`) to find the bit difference between the two numbers.
 - Use `bin()` to convert the result to a binary string.
-- Convert the string to a list and use `list.count()` to count and return the number of `1`s in it.
+- Convert the string to a list and use `count()` of `str` class to count and return the number of `1`s in it.
 
 ```py
 def hamming_distance(a, b):
-  return list(bin(a ^ b)).count('1')
+  return bin(a ^ b).count('1')
 ```
 
 ```py