docs(groceries): correct grammar

subjects/groceries/README.md

@@ -2,16 +2,10 @@
 
 ### Instructions
 
-Create a **function** called `insert` that inserts a new element at the end of the `Vec`.
+Create a **function** named `insert`, that inserts a new element at the end of the `Vec`.
 
-And another **function** `at_index` that returns the value found at the index passed as an argument.
+Create another **function** named `at_index` that returns the value found at the index passed as an argument.
 
-### Notions
-
-- [Common Collections](https://doc.rust-lang.org/stable/book/ch08-00-common-collections.html)
-- [Vectors](https://doc.rust-lang.org/stable/book/ch08-01-vectors.html)
-
-### Expected Functions
 
 ```rust
 pub fn insert(vec: &mut Vec<String>, val: String) {
@@ -31,12 +25,12 @@ use groceries::{insert, at_index};
 fn main() {
 	let mut groceries = vec![
 		"yogurt".to_string(),
-		"panetone".to_string(),
+		"panettone".to_string(),
 		"bread".to_string(),
 		"cheese".to_string(),
 	];
 	insert(&mut groceries, String::from("nuts"));
-	println!("The groceries list now = {:?}", &groceries);
+	println!("The groceries list contains {:?}", &groceries);
 	println!(
 		"The second element of the grocery  list is {:?}",
 		at_index(&groceries, 1)
@@ -48,7 +42,12 @@ And its output:
 
 ```console
 $ cargo run
-The groceries list now = ["yogurt", "panetone", "bread", "cheese", "nuts"]
-The second element of the grocery  list is "panetone"
+The groceries list contains ["yogurt", "panettone", "bread", "cheese", "nuts"]
+The second element of the grocery  list is "panettone"
 $
 ```
+
+### Notions
+
+- [Common Collections](https://doc.rust-lang.org/stable/book/ch08-00-common-collections.html)
+- [Vectors](https://doc.rust-lang.org/stable/book/ch08-01-vectors.html)