Fix typo in docs

README.md

@@ -140,7 +140,7 @@ emails.
 
 #### Database connection needed
 
-The monitoring processes talk to the KM3NeT Oracle DB service and need an
+The monitoring processes talk to the KM3NeT Oracle DB service and need a
 valid session cookie. The monitoring servers of the ORCA and ARCA shore stations
 are whitelisted, but if you run the system on other machines, you need to provide
 the cookie string for that specific machine. To get the cookie string, run the