docs(lalgebra_scaler) correct grammar

subjects/lalgebra_scalar/README.md

@@ -2,19 +2,15 @@
 
 ### Instructions
 
-Define a `Scalar` trait which must implement the operations Addition, Subtraction, Multiplication and Division (you might also have to use more restrictions). For this use a trait inheritance (supertraits)
+Define a `Scalar` trait which implements the operations `Add`, `Sub`, `Mul`, `Div` and any other restrictions you may need. Use a trait inheritance (supertraits)
 
-Another condition for a number to be a scalar is to have a zero (neutral element in the addition) and a one (neutral element in the multiplication). Therefore the `Scalar` trait will require 2 functions zero() and one() (as shown)
+Another condition for a number to be a scalar is to have a `zero` (as the neutral element in the addition), and a `one` (as the neutral element in the multiplication). Therefore the `Scalar` trait will require these two functions (described below).
 
-After finishing completing the declaration of the trait, implement the `Scalar` trait for u32, u64, i32, i64, f32 and f64.
-
-### Notions
-
-- [Module std::ops](https://doc.rust-lang.org/std/ops/index.html)
+After finishing completing the declaration of the trait, implement the `Scalar` trait for `u32`, `u64`, `i32`, `i64`, `f32` and `f64`.
 
 ### Expected Function (The signature must be completed)
 
-#### You need add the impl for each cases asked in the subject
+> You need add the impl for each cases asked in the subject
 
 ```rust
 pub trait Scalar: _ {
@@ -49,3 +45,7 @@ $ cargo run
 1
 $
 ```
+
+### Notions
+
+- [Module std::ops](https://doc.rust-lang.org/std/ops/index.html)