docs(abs): correct grammar

subjects/abs/README.md

@@ -2,23 +2,19 @@
 
 ### Instructions
 
-Create a `isPositive` function that takes a number as
-parameter and return true if the given number is
-stricly positive, or false otherwise
+Create a function named `isPositive` that takes a number as a argument, returning `true` if the number is strictly positive, and `false` otherwise.
 
-Create the `abs` function that takes one number argument
-and returns its absolute value.
-You are not allowed to use `Math.abs`, make your own.
+Create a function named `abs` that takes a number as an argument and returns its absolute value. You must make your own implementation. You **must not** use `Math.abs()`.
 
 ### Notions
 
-- [nan-academy.github.io/js-training/examples/functions.js](https://nan-academy.github.io/js-training/examples/functions.js)
-- [nan-academy.github.io/js-training/examples/ternary.js](https://nan-academy.github.io/js-training/examples/ternary.js)
-- [devdocs.io/javascript/global_objects/math/abs](https://devdocs.io/javascript/global_objects/math/abs)
+- [Functions](https://nan-academy.github.io/js-training/examples/functions.js)
+- [Ternary](https://nan-academy.github.io/js-training/examples/ternary.js)
+- [Math.abs](https://devdocs.io/javascript/global_objects/math/abs)
 
 ### Code provided
 
-> all code provided will be added to your solution and does not need to be submited.
+> The provided code will be added to your solution, and does not need to be submitted.
 
 ```js
 Math.abs = undefined