Improved wording on javascript getting started guide

Author: GregHolmes

content/getting-started/javascript.textile

@@ -53,7 +53,7 @@ npm install ably
 
 h2(#step-1). Step 1: Connect to Ably
 
-Clients establish a connection with Ably when they instantiate an SDK. This enables them to send and receive messages in realtime across channels.
+Clients establish a connection with Ably when they instantiate an SDK instance. This enables them to send and receive messages in realtime across channels.
 
 * Open up the "dev console":https://ably.com/accounts/any/apps/any/console of your first app before instantiating your client so that you can see what happens.