docs(tic_tac_toe): correct grammar

subjects/tic_tac_toe/README.md

@@ -2,33 +2,18 @@
 
 ### Instructions
 
-You must create a `tic tac toe` checker.
-
-Create the following functions:
-
-- `tic_tac_toe` which receives:
-  - a table of vectors (Vec<Vec<&str>>).
-  - It should return a String `player O won` or `player X won` or `Tie`.
-- `diagonals` which will receive:
-  - a player and a table.
-  - It should return a boolean, this must return `true` if one of the diagonals are completed by the player.
-- `horizontal` which will receive:
-  - a player and a table.
-  - It should return a boolean, this must return `true` if one of the horizontal lines are completed by the player.
-- `vertical` which will receive:
-  - a player and a table.
-  - It should return a boolean, this must return `true` if one of the vertical lines are completed by the player.
+You must create some functions for a tic-tac-toe checker.
 
-### Notions
-
-- [references and borrowing](https://doc.rust-lang.org/book/ch04-02-references-and-borrowing.html)
-
-### Expected Functions
+Create a function named `tic_tac_toe`, which receives a tic-tac-toe table. It should return the appropriate string: `"player O won"`, `"player X won"` or `"Tie"`.
 
 ```rust
 pub fn tic_tac_toe(table: Vec<Vec<&str>>) -> String {
 }
+```
+
+Also create the following functions, which each accept a player and a table. These functions should return `true` if the player has completed one of the diagonals, rows or columns:
 
+```rust
 pub fn diagonals(player: &str, table: &Vec<Vec<&str>>) -> bool {
 }
 
@@ -41,7 +26,7 @@ pub fn vertical(player: &str, table: &Vec<Vec<&str>>) -> bool {
 
 ### Usage
 
-Here is a program to test your function
+Here is a program to test your `tic_tac_toe`. You'll need to test the other functions yourself. But they'll probably be useful for implementing your `tic_tac_toe` checker.
 
 ```rust
 use tic_tac_toe::*;
@@ -86,3 +71,7 @@ $ cargo run
 "player X won"
 $
 ```
+
+### Notions
+
+- [references and borrowing](https://doc.rust-lang.org/book/ch04-02-references-and-borrowing.html)