Correct indent

2 spaces and 4 spaces were mixed up, then changes to 4 spaces.

Change-Id: I4e41189a97604a75e783d3b948d2693c257a21f4

@@ -31,12 +31,14 @@ public interface DatabaseProxy<K, V> {
 
     /**
      * Returns a set of all tables names.
+     *
      * @return A completable future to be completed with the result once complete.
      */
     CompletableFuture<Set<String>> tableNames();
 
     /**
      * Returns a mapping from counter name to next value.
+     *
      * @return A completable future to be completed with the result once complete.
      */
     CompletableFuture<Map<String, Long>> counters();