Add RAMCloud related memo

- Mark original TableEnumerator, which had performance issue.
- Add notes about what is limiting the multi operation limit.

Change-Id: I8b9adc601b16cd4bf98f2d571e822077bf75f2d7
diff --git a/src/main/java/edu/stanford/ramcloud/JRamCloud.java b/src/main/java/edu/stanford/ramcloud/JRamCloud.java
index ffc092f..e8aba19 100644
--- a/src/main/java/edu/stanford/ramcloud/JRamCloud.java
+++ b/src/main/java/edu/stanford/ramcloud/JRamCloud.java
@@ -208,6 +208,7 @@
         final public long nextHash;
     }
 
+    @Deprecated
     public class TableEnumerator {
         private long tableEnumeratorObjectPointer = 0;
         private long ramCloudObjectPointer = 0;