Docsp 17234 (#177)

* document Netty config

* fix api link

* nits

* nits

* fix typo

Author: terakilobyte

source/fundamentals/connection/tls.txt

@@ -217,13 +217,13 @@ To restrict your application to use only the TLS 1.2 protocol, set the
 
 .. _tls-custom-sslContext:
 
-Customize TLS/SSL Configuration with an SSLContext
---------------------------------------------------
+Customize TLS/SSL Configuration through the Java SE SSLContext
+--------------------------------------------------------------
 
 If your TLS/SSL configuration requires additional customization, you can
 set the ``sslContext`` property of your ``MongoClient`` by
 passing an `SSLContext
-<https://docs.oracle.com/javase/8/docs/api/javax/net/ssl/class-use/SSLContext.html>`__
+<https://docs.oracle.com/javase/8/docs/api/javax/net/ssl/SSLContext.html>`__
 object to the builder in the ``applyToSslSettings()`` lambda:
 
 .. code-block:: java
@@ -237,6 +237,44 @@ object to the builder in the ``applyToSslSettings()`` lambda:
         .build();
    MongoClient client = MongoClients.create(settings);
 
+Customize TLS/SSL Configuration through the Netty SslContext
+------------------------------------------------------------
+
+If you use the driver with `Netty <https://netty.io/>`__ for network IO,
+you have an option to plug an alternative TLS/SSL protocol implementation
+provided by Netty.
+
+.. code-block:: java
+   :copyable: true
+
+   import com.mongodb.MongoClientSettings;
+   import com.mongodb.client.MongoClients;
+   import com.mongodb.client.MongoClient;
+   import com.mongodb.connection.netty.NettyStreamFactoryFactory;
+   import io.netty.handler.ssl.SslContext;
+   import io.netty.handler.ssl.SslContextBuilder;
+   import io.netty.handler.ssl.SslProvider;
+
+To instruct the driver to use `io.netty.handler.ssl.SslContext <https://netty.io/4.1/api/io/netty/handler/ssl/SslContext.html>`__,
+use the `NettyStreamFactoryFactory.Builder.sslContext <{+api+}/apidocs/mongodb-driver-core/com/mongodb/connection/netty/NettyStreamFactoryFactory.Builder.html#sslContext(io.netty.handler.ssl.SslContext)>`__
+method. See the method documentation for details about the different `io.netty.handler.ssl.SslProvider <https://netty.io/4.1/api/io/netty/handler/ssl/SslProvider.html>`__
+variants the driver supports and the implications of using them.
+
+.. code-block:: java
+   :copyable: true
+
+   SslContext sslContext = SslContextBuilder.forClient()
+           .sslProvider(SslProvider.OPENSSL)
+           .build();
+   MongoClientSettings settings = MongoClientSettings.builder()
+           .applyToSslSettings(builder -> builder.enabled(true))
+           .streamFactoryFactory(NettyStreamFactoryFactory.builder()
+                   .sslContext(sslContext)
+                   .build())
+           .build();
+   MongoClient client = MongoClients.create(settings);
+
+
 Online Certificate Status Protocol (OCSP)
 -----------------------------------------