Update CreateCollection.java

Remove comments that don't pertain to the focus of this code example

Author: djsauble

astra-db-client/src/test/java/com/dtsx/astra/sdk/documentation/CreateCollection.java

@@ -8,7 +8,6 @@
 
 public class CreateCollection {
   public static void main(String[] args) {
-    // Given an active db
     AstraDB db = new AstraDB("<token>", "<api_endpoint>");
 
     // Create a non-vector collection