Add min/max size for replSetResizeOplog

Author: kay-kim

source/reference/command/replSetResizeOplog.txt

@@ -32,9 +32,12 @@ Definition
 
    .. note::
 
-      :dbcommand:`replSetResizeOplog` takes the size parameter
-      in megabytes, while the oplog size is stored in bytes. The size
-      parameter must also be over 990 megabytes.
+      :dbcommand:`replSetResizeOplog` takes the size parameter in
+      megabytes while the oplog size is stored in bytes:
+
+      - The minimum size you can specify is 990 megabytes.
+
+      - The maximum size you can specify is 1 petabytes.
 
 Behavior
 --------