Update readme

Author: Khanh Do

README.md

@@ -5,13 +5,14 @@ complexity and how I arrive at them.
 
 For expediency, when problems involve an array, I am OK with using a Python list
 instead and using the following operations:
-- `for i in range(n):` to iterate over the list
+- `for i in range(n):` to iterate over indexes
 -  `for i in range(bigger, smaller, -1):` to iterate backwards
-- `for i, v in enumerate(nums):` to iterate over index and value simultaneously
+- `for num in nums:` to iterate over values
+- `for i, num in enumerate(nums):` to iterate over indexes and values simultaneously
 - `nums[-1]` to get the last element
 
-While these operations are indeed Pythonic, they don't provide any extra
-fundamental functionality over a low-level array. No shortcuts are intentionally
+While these operations are indeed Pythonic, they don't fundamentally provide any
+extra functionality over a low-level array. No shortcuts are intentionally
 made to evade the topic(s) or data structure(s) that the question is testing.
 
 I very much welcome suggestions and corrections. Thanks.