Update USERS.md

Fix formatting

USERS.md

@@ -31,6 +31,6 @@ Learn more from Tech Talk by Reed Allman: http://www.youtube.com/watch?v=HTjt6oj
 ## Tango Me
 Tango is using RocksDB as a graph storage to store all users' connection data and other social activity data.
 
-# Turn
+## Turn
 Turn is using RocksDB as a storage layer for their key/value store, serving at peak 2.4MM QPS out of different datacenters.
 Check out our RocksDB Protobuf merge operator at: https://github.com/vladb38/rocksdb_protobuf