lower case

Author: ZhenhangTung

en/02.3.md

@@ -327,7 +327,7 @@ Now we can change the value of `x` in the functions. Why do we use pointers? Wha
 
 - Allows us to use more functions to operate on one variable.
 - Low cost by passing memory addresses (8 bytes), copy is not an efficient way, both in terms of time and space, to pass variables.
-- `Channel`, `slice` and `map` are reference types, so they use pointers when passing to functions by default. (Attention: If you need to change the length of `slice`, you have to pass pointers explicitly)
+- `channel`, `slice` and `map` are reference types, so they use pointers when passing to functions by default. (Attention: If you need to change the length of `slice`, you have to pass pointers explicitly)
 
 ### defer