docs(tuples): correct grammar

subjects/tuples/README.md

@@ -2,32 +2,10 @@
 
 ### Instructions
 
-- Define a tuple structure to represent a `Student`.
-
-- Each student is identified by an id number of type i32, his/her name and his/her last name of type string. 
+- Define a tuple `struct` to represent a `Student`. Each is identified by an id of type `i32`, their first name and last name.
 
 - Then define three **functions** to return the id, first name and last name.
 
-### Notions
-
-- [Defining a struct](https://doc.rust-lang.org/stable/book/ch05-01-defining-structs.html)
-
-- [The Tuple Type](https://doc.rust-lang.org/stable/book/ch03-02-data-types.html?highlight=accessing%20a%20tuple#compound-types)
-
-- [Tuples](https://doc.rust-lang.org/rust-by-example/primitives/tuples.html)
-
-- [Tuple Structs without Named Fields](https://doc.rust-lang.org/stable/book/ch05-01-defining-structs.html?highlight=tuple#using-tuple-structs-without-named-fields-to-create-different-types)
-
-- [Adding Useful Functionality with Derived Traits](https://doc.rust-lang.org/stable/book/ch05-02-example-structs.html?highlight=debug%20deriv#adding-useful-functionality-with-derived-traits)
-
-- [Chapter 7](https://doc.rust-lang.org/stable/book/ch07-03-paths-for-referring-to-an-item-in-the-module-tree.html)
-
-### Dependencies
-
-meval = "0.2"
-
-### Expected Functions
-
 ```rust
 pub fn id(student: &Student) -> i32 {
 }
@@ -39,6 +17,11 @@ pub fn last_name(student: &Student) -> String {
 }
 ```
 
+### Dependencies
+
+meval = "0.2"
+
+
 ### Usage
 
 Here is a program to test your functions
@@ -65,3 +48,17 @@ Student last name: Domingos
 Student Id: 20
 $
 ```
+
+### Notions
+
+- [Defining a struct](https://doc.rust-lang.org/stable/book/ch05-01-defining-structs.html)
+
+- [The Tuple Type](https://doc.rust-lang.org/stable/book/ch03-02-data-types.html?highlight=accessing%20a%20tuple#compound-types)
+
+- [Tuples](https://doc.rust-lang.org/rust-by-example/primitives/tuples.html)
+
+- [Tuple Structs without Named Fields](https://doc.rust-lang.org/stable/book/ch05-01-defining-structs.html?highlight=tuple#using-tuple-structs-without-named-fields-to-create-different-types)
+
+- [Adding Useful Functionality with Derived Traits](https://doc.rust-lang.org/stable/book/ch05-02-example-structs.html?highlight=debug%20deriv#adding-useful-functionality-with-derived-traits)
+
+- [Chapter 7](https://doc.rust-lang.org/stable/book/ch07-03-paths-for-referring-to-an-item-in-the-module-tree.html)