Update FindAllCollections.java

* Add space between `package` statement and the imports.
* Explain better what the code is printing out
* Remove comments that aren't core to the example
* Add space between params that are printed out

Author: djsauble

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

@@ -1,20 +1,19 @@
 package com.dtsx.astra.sdk.documentation;
+
 import com.dtsx.astra.sdk.AstraDB;
 import io.stargate.sdk.json.domain.CollectionDefinition;
 
 public class FindAllCollections {
   public static void main(String[] args) {
-
-    // Given an active db
     AstraDB db = new AstraDB("<token>", "<api_endpoint>");
 
-    // Iterate over all collections
+    // Iterate over all collections and print each vector definition
     db.findAllCollections().forEach(col -> {
       System.out.print("\nname=" + col.getName());
       if (col.getOptions() != null && col.getOptions().getVector() != null) {
         CollectionDefinition.Options.Vector vector = col.getOptions().getVector();
-        System.out.print(",dim=" + vector.getDimension());
-        System.out.print(",metric=" + vector.getMetric());
+        System.out.print(", dim=" + vector.getDimension());
+        System.out.print(", metric=" + vector.getMetric());
       }
     });
   }