veb.auth: update the README.md example (#25245)

Author: 449

vlib/veb/auth/README.md

@@ -51,17 +51,14 @@ pub fn (mut app App) register_user(mut ctx Context, name string, password string
 		password_hash: auth.hash_password_with_salt(password, salt)
 		salt:          salt
 	}
-	sql app.db {
+	user_id := sql app.db {
 		insert new_user into User
-	} or {}
-
-	// Get new user ID (until RETURNING is supported by ORM)
-	if x := app.find_user_by_name(name) {
-		// Generate and insert the token using user ID
-		token := app.auth.add_token(x.id) or { '' }
-		// Authenticate the user by adding the token to the cookies
-		ctx.set_cookie(name: 'token', value: token)
-	}
+	} or { 0 }
+
+	// Generate and insert the token using user ID
+	token := app.auth.add_token(user_id) or { '' }
+	// Authenticate the user by adding the token to the cookies
+	ctx.set_cookie(name: 'token', value: token)
 
 	return ctx.redirect('/')
 }
@@ -97,4 +94,4 @@ iteration. This is not secure for production use, and you should use a more secu
 algorithm and multiple iterations.
 
 See also:
-- [OWASP Password Storage Cheat Sheet](https://cheatsheetseries.owasp.org/cheatsheets/Password_Storage_Cheat_Sheet.html)
+- [OWASP Password Storage Cheat Sheet](https://cheatsheetseries.owasp.org/cheatsheets/Password_Storage_Cheat_Sheet.html)