Merge pull request #364 from ddproxy/issue-363

Modify async_events.md grammar

Author: makasim

docs/bundle/async_events.md

@@ -7,25 +7,24 @@ The consumer, once it receives the message, restores the event and dispatches it
 
 Async listeners benefits:
 
-* The response time lesser. It has to do less work.
-* Better fault tolerance. Bugs in async listener does not affect user. Messages will wait till you fix bugs.
+* Reduces response time. Work is deferred to consumer processes.
+* Better fault tolerance. Bugs in async listener do not affect user. Messages will wait till you fix bugs.
 * Better scaling. Add more consumers to meet the load.
 
-_**Note**: The php serializer transformer (the default one) does not work on Symfony prior 3.0. The event contains eventDispatcher and therefor could not be serialized. You have to register a transformer for every async event. Read the [event transformer](#event-transformer)._
+_**Note**: Prior to Symfony 3.0, events contain `eventDispatcher` and the default php serializer transformer is unable to serialize the object. A transformer should be registered for every async event. Read the [event transformer](#event-transformer)._
 
 ## Configuration
 
-I suppose you already [installed the bundle](quick_tour.md#install). 
-Now, you have to enable `async_events`. 
-If you do not enable it, events will be processed as before: synchronously.
+Symfony events are currently processed synchronously, enabling the async configuration for EnqueueBundle causes tagged listeners to defer action to a consumer asynchronously.
+If you already [installed the bundle](quick_tour.md#install), then enable `async_events`.
 
 ```yaml
 # app/config/config.yml
 
 enqueue:
    async_events:
       enabled: true
-      # if you'd like to send send messages onTerminate use spool_producer (it makes response time even lesser):
+      # if you'd like to send send messages onTerminate use spool_producer (it further reduces response time):
       # spool_producer: true
 ```
 
@@ -77,7 +76,7 @@ services:
 ## Event transformer
 
 The bundle uses [php serializer](https://github.com/php-enqueue/enqueue-dev/blob/master/pkg/enqueue-bundle/Events/PhpSerializerEventTransformer.php) transformer by default to pass events through MQ.
-You could create a transformer for the given event type. The transformer must implement `Enqueue\AsyncEventDispatcher\EventTransformer` interface.
+You can write a transformer for each event type by implementing the `Enqueue\AsyncEventDispatcher\EventTransformer` interface.
 Consider the next example. It shows how to send an event that contains Doctrine entity as a subject  
 
 ```php
@@ -165,4 +164,4 @@ services:
 The `eventName` attribute accepts a regexp. You can do next `eventName: '/foo\..*?/'`. 
 It uses this transformer for all event with the name beginning with `foo.`
 
-[back to index](../index.md)
+[back to index](../index.md)