Update DeleteOne.java

* Use a two-space indent
* Add space between method params
* Remove comments that aren't core to the example
* Reword the comment slightly

Author: djsauble

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

@@ -5,16 +5,11 @@
 import io.stargate.sdk.json.domain.DeleteQuery;
 
 public class DeleteOne {
-    public static void main(String[] args) {
+  public static void main(String[] args) {
+    AstraDB db = new AstraDB("<token>", "<api_endpoint>");
+    AstraDBCollection collection = db.createCollection("collection_vector1", 14);
 
-// Given an active db and a collection with a vector field (see CreateCollection.java)
-AstraDB db = new AstraDB("<token>", "<api_endpoint>");
-
-// Create collection if not exists
-AstraDBCollection collection = db
- .createCollection("collection_vector1",14);
-
-// Delete item based on a query
-int deletedCount = collection.deleteOne(DeleteQuery.deleteById("id1"));
-}
+    // Delete items from an existing collection with a query
+    int deletedCount = collection.deleteOne(DeleteQuery.deleteById("id1"));
+  }
 }