docs(spelling) correct grammar

subjects/spelling/README.md

@@ -2,26 +2,20 @@
 
 ### Instructions
 
-In this exercise a number between 0 and 1000000 will be generated.
-Your purpose is to create the function `spell` that will spell the numbers generated.
+In this exercise, you'll create the function `spell` that will spell a generated number.
 
-So, if the program generates the number:
+Here are some examples of what your function should return:
 
-- 1 your function will return the string "one"
-- 14 your function will return the string "fourteen".
-- 96 your function will return the string "ninety-six"
-- 100 your function will return the string "one hundred".
-- 101 your function will return the string "one hundred one"
-- 348 your function will return the string "one hundred twenty-three"
-- 1002 your function will return the string "one thousand two".
-- 1000000 your function will return the string "one million"
-
-Only positive numbers will be tested. (Up to a million).
-
-### Notions
-
-- [patterns](https://doc.rust-lang.org/book/ch18-00-patterns.html)
+- `1` -> `"one"`
+- `14` -> `"fourteen".`
+- `96` -> `"ninety-six"`
+- `100` -> `"one hundred".`
+- `101` -> `"one hundred one"`
+- `348` -> `"one hundred twenty-three"`
+- `1002` -> `"one thousand two".`
+- `1000000` -> `"one million"`
 
+> Only positive numbers will be tested, up to `"one million"`.
 
 ### Expected function
 
@@ -52,3 +46,7 @@ three hundred forty-eight
 nine thousand nine hundred ninety-six
 $
 ```
+
+### Notions
+
+- [patterns](https://doc.rust-lang.org/book/ch18-00-patterns.html)