Add 4.0 reference documantation

* Update What's New in 3.8
* Add change stream examples for MongoDatabase and MongoClient

Author: jyemin

docs/reference/content/driver-async/tutorials/change-streams.md

@@ -8,7 +8,7 @@ title = "Change Streams"
   pre = "<i class='fa'></i>"
 +++
 
-## Change Streams - Draft
+## Change Streams
 
 MongoDB 3.6 introduces a new [`$changeStream`](http://dochub.mongodb.org/core/changestreams) aggregation pipeline
 operator.
@@ -74,14 +74,40 @@ For additional information on connecting to MongoDB, see [Connect to MongoDB]({{
 
 ## Watch the collection
 
-To create a change stream use the the [`MongoCollection.watch()`]({{<apiref "com/mongodb/client/MongoCollection.html#watch">}}) method.
+To create a change stream use one the [`MongoCollection.watch()`]({{<apiref "com/mongodb/async/client/MongoCollection.html#watch">}}) 
+methods.
 
 In the following example, the change stream prints out all changes it observes.
 
 ```java
 collection.watch().forEach(printBlock, callbackWhenFinished);
 ```
 
+## Watch the database
+
+New in the 3.8 driver and MongoDB 4.0, applications can open a single change stream to watch all non-system collections of a database. To
+create such a change stream use one of the [`MongoDatabase.watch()`]({{<apiref "com/mongodb/async/client/MongoDatabase.html#watch">}}) 
+methods.
+
+In the following example, the change stream prints out all the changes it observes on the given database.
+
+```java
+database.watch().forEach(printBlock, callbackWhenFinished);
+```
+
+## Watch all databases
+
+New in the 3.8 driver and MongoDB 4.0, applications can open a single change stream to watch all non-system collections of all databases 
+in a MongoDB deployment. To create such a change stream use one of the 
+[`MongoClient.watch()`]({{<apiref "com/mongodb/async/client/MongoClient.html#watch">}}) methods.
+
+In the following example, the change stream prints out all the changes it observes on the deployement to which the `MongoClient` is
+connected
+
+```java
+mongoClient.watch().forEach(printBlock, callbackWhenFinished);
+```
+
 ## Filtering content
 
 The `watch` method can also be passed a list of [aggregation stages]({{< docsref "meta/aggregation-quick-reference" >}}), that can modify 

docs/reference/content/driver/tutorials/change-streams.md

@@ -8,7 +8,7 @@ title = "Change Streams"
   pre = "<i class='fa'></i>"
 +++
 
-## Change Streams - Draft
+## Change Streams
 
 MongoDB 3.6 introduces a new [`$changeStream`](http://dochub.mongodb.org/core/changestreams) aggregation pipeline
 operator.
@@ -63,14 +63,38 @@ For additional information on connecting to MongoDB, see [Connect to MongoDB]({{
 
 ## Watch the collection
 
-To create a change stream use the the [`MongoCollection.watch()`]({{<apiref "com/mongodb/client/MongoCollection.html#watch">}}) method.
+To create a change stream use one of the [`MongoCollection.watch()`]({{<apiref "com/mongodb/client/MongoCollection.html#watch">}}) methods.
 
 In the following example, the change stream prints out all changes it observes.
 
 ```java
 collection.watch().forEach(printBlock);
 ```
 
+## Watch the database
+
+New in the 3.8 driver and MongoDB 4.0, applications can open a single change stream to watch all non-system collections of a database. To
+create such a change stream use one of the [`MongoDatabase.watch()`]({{<apiref "com/mongodb/client/MongoDatabase.html#watch">}}) methods.
+
+In the following example, the change stream prints out all the changes it observes on the given database.
+
+```java
+database.watch().forEach(printBlock);
+```
+
+## Watch all databases
+
+New in the 3.8 driver and MongoDB 4.0, applications can open a single change stream to watch all non-system collections of all databases 
+in a MongoDB deployment. To create such a change stream use one of the 
+[`MongoClient.watch()`]({{<apiref "com/mongodb/client/MongoClient.html#watch">}}) methods.
+
+In the following example, the change stream prints out all the changes it observes on the deployement to which the `MongoClient` is
+connected
+
+```java
+mongoClient.watch().forEach(printBlock);
+```
+
 ## Filtering content
 
 The `watch` method can also be passed a list of [aggregation stages]({{< docsref "meta/aggregation-quick-reference" >}}), that can modify 

docs/reference/content/whats-new.md

@@ -13,7 +13,16 @@ Key new features of the 3.8 Java driver release:
 
 ### Transactions
 
-The Java driver now provides support for executing CRUD operations within a transaction (requires MongoDB 4.0).
+The Java driver now provides support for executing CRUD operations within a transaction (requires MongoDB 4.0).  See the 
+[Transactions and MongoDB Drivers](https://docs.mongodb.com/master/core/transactions/#transactions-and-mongodb-drivers) section
+of the documentation and select the `Java (Sync)` tab.
+
+### Change Stream enhancements
+
+The Java driver now provides support for opening a change stream against an entire database, via new 
+[`MongoDatabase.watch`]({{<apiref "com/mongodb/client/MongoDatabase.html">}}) methods, or an 
+entire deployment, via new [`MongoClient.watch`]({{<apiref "com/mongodb/client/MongoClient.html">}}) methods. See 
+[Change Streams]({{<ref "driver/tutorials/change-streams.md">}}) for further details.
 
 ### SCRAM-256 Authentication Mechanism