docs(string_literalss): correct grammar

subjects/name_initials/README.md

@@ -5,20 +5,15 @@
 Create a **function** called `initials`, this function will receive a vector of string literals
 with names and return a vector of Strings with the initials of each name.
 
-> This exercise will test how many times the **heap is going to be allocated**!\
-> So try your best to allocate the minimum data on the heap!
-
-### Notions
-
-- [stack and heap](https://doc.rust-lang.org/1.22.0/book/first-edition/the-stack-and-the-heap.html)
-
-### Expected Function
-
 ```rust
 pub fn initials(names: Vec<&str>) -> Vec<String> {
 }
 ```
 
+> This exercise will test how many times the **heap is going to be allocated**!\
+> So try your best to allocate the minimum data on the heap!
+
+
 ### Usage
 
 Here is a program to test your function:
@@ -39,3 +34,7 @@ $ cargo run
 ["H. P.", "S. E.", "J. L.", "B. O."]
 $
 ```
+
+### Notions
+
+- [stack and heap](https://doc.rust-lang.org/1.22.0/book/first-edition/the-stack-and-the-heap.html)