Code cleanup

src/main/java/org/redisson/RedissonKeys.java

@@ -282,7 +282,7 @@ public class RedissonKeys implements RKeys {
     }
 
     @Override
-    public Long count() {
+    public long count() {
         return commandExecutor.get(countAsync());
     }
 

src/main/java/org/redisson/core/RKeys.java

@@ -95,7 +95,7 @@ public interface RKeys extends RKeysAsync {
      *
      * @return
      */
-    Long count();
+    long count();
 
     /**
      * Delete all keys of currently selected database

src/main/java/org/redisson/core/RedissonMultiLock.java

@@ -35,8 +35,7 @@ import io.netty.util.concurrent.Promise;
 import io.netty.util.internal.PlatformDependent;
 
 /**
- * Guarantees multiple locks operation handling (lock, tryLock...)
- * in atomic way without deadlocks.
+ * Groups multiple independent locks and handles them as one lock.
  *
  * @author Nikita Koksharov
  *

src/main/java/org/redisson/reactive/RedissonKeysReactive.java

@@ -39,7 +39,7 @@ public class RedissonKeysReactive implements RKeysReactive {
 
     private final CommandReactiveService commandExecutor;
 
-    RedissonKeys instance;
+    private final RedissonKeys instance;
 
     public RedissonKeysReactive(CommandReactiveService commandExecutor) {
         super();