[README] typo

README.md

@@ -11,7 +11,7 @@ The cluster monitor counts three entities:
   performing `ssh` commands to other nodes (especially `access1-cp`) to gather the cluster state.\
   **Code:** `rl_hm/data_fetcher/`
 - The **backend server** is running on a Linux server external to Inria and is receiving the **data
-  fetcher** updates through an TCP socket connection running over an SSH tunnel.
+  fetcher** updates through a TCP socket connection running over an SSH tunnel.
   It exposes a [Socket.IO](https://socket.io/) server to the web clients that connect to it.
   As soon as it receives an update from the **data fetcher**, it pushes it to all of the connected
   clients through the _socket-io_ connection.\