[ci skip] Transaction documentation errors

docs/docs/transactions.md

@@ -6,7 +6,7 @@ The key difference is that the managed transaction uses a callback that expects
 
 ### Auto commit/rollback
 ```js
-return sequelize.transaction(t) {
+return sequelize.transaction(function (t) {
   return User.create({
     firstName: 'Abraham',
     lastName: 'Lincoln'
@@ -25,9 +25,9 @@ return sequelize.transaction(t) {
 });
 ```
 
-### Handled by user
+### Handled manually
 ```js    
-return sequelize.transaction().function (t) {
+return sequelize.transaction().then(function (t) {
   return User.create({
     firstName: 'Homer',
     lastName: 'Simpson'
@@ -48,4 +48,4 @@ return sequelize.transaction().function (t) {
 
 The `transaction` option goes with most other options, which are usually the first argument of a method.
 For methods that take values, like `.create`, `.update()`, `.updateAttributes()` and more `transaction` should be passed to the option in the second argument.
-If unsure, refer to the api documentation for the method you are using to be sure of the signature.
\ No newline at end of file
+If unsure, refer to the api documentation for the method you are using to be sure of the signature.