Update OAuth2-Front-Approach.md

OAuth2-Front-Approach.md

@@ -112,7 +112,7 @@ const loginWithGoogle = () => {
 
 <br>
 
-#### 2.1 Frontend
+### 2.1 Frontend
 
 Now that the frontend has the Authorization `code` on the callback url, it can send it to the backend
 
@@ -174,7 +174,7 @@ export default Callback;
 
 <br>
 
-#### 2.2 Backend
+### 2.2 Backend
 
 1. The Backend **receives** the authorization `code` form the Frontend POST at `xorismesiti.gr/api/auth/exchange-token`
 2. The Backend **POST** the Authorization `code` to Google API
@@ -277,7 +277,7 @@ app.listen(3000, () => {
 
 <br>
 
-#### 2.3 Front
+### 2.3 Front
 
 The frontend gets the tokens from the backend response,