Update FindCollection.java

* Two-space indent
* Proper spacing between package and import statements
* Remove non-core comments

Author: djsauble

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

@@ -1,19 +1,17 @@
 package com.dtsx.astra.sdk.documentation;
+
 import com.dtsx.astra.sdk.AstraDB;
 import io.stargate.sdk.json.domain.CollectionDefinition;
-
 import java.util.Optional;
 
 public class FindCollection {
   public static void main(String[] args) {
-
-    // Given an active db
     AstraDB db = new AstraDB("<token>", "<api_endpoint>");
 
     // Find a collection
     Optional<CollectionDefinition> collection = db.findCollection("collection_vector1");
 
-    // Another test with a collection that does not exist
+    // Verify if a collection exists
     boolean collectionExists = db.isCollectionExists("collection_vector2");
   }
 }