javadocs fixed

redisson/src/main/java/org/redisson/api/RExpirable.java

@@ -64,7 +64,7 @@ public interface RExpirable extends RObject, RExpirableAsync {
     boolean clearExpire();
 
     /**
-     * Remaining time to live of Redisson object that has a timeout
+     * Remaining time to live of Redisson object that has a timeout 
      *
      * @return time in milliseconds
      *          -2 if the key does not exist.

redisson/src/main/java/org/redisson/api/RExpirableAsync.java

@@ -64,9 +64,11 @@ public interface RExpirableAsync extends RObjectAsync {
     RFuture<Boolean> clearExpireAsync();
 
     /**
-     * Get remaining time to live of object in seconds.
+     * Remaining time to live of Redisson object that has a timeout 
      *
-     * @return <code>-1</code> if object does not exist or time in seconds
+     * @return time in milliseconds
+     *          -2 if the key does not exist.
+     *          -1 if the key exists but has no associated expire.
      */
     RFuture<Long> remainTimeToLiveAsync();