small fix

Author: rustagir

source/connect-to-mongo/tls.txt

@@ -32,10 +32,10 @@ This can be changed either by using the `Netty API
 <https://netty.io/4.1/api/>`__ or the extensibility of the `Java SE
 API <https://docs.oracle.com/javase/8/docs/api/>`__.
 
-.. tip::
+.. tip:: Prefer Netty for Asynchronous Apps
 
    We recommend using Netty for asychronous applications, as it supports
-   asynchronous IO and handles high connection volumes effectively. To
+   asynchronous I/O and handles high connection volumes effectively. To
    learn about using Netty to configure your TLS settings, see the
    :ref:`java-rs-tls-netty-config` section of this guide.