"the the" typo replaced by "the"

Author: notmuhammad

src/content/3/en/part3d.md

@@ -133,7 +133,7 @@ It is also vital to follow continuously the server logs. The problem became obvi
 
 The database url was _undefined_, so the command *fly secrets set MONGODB\_URI* was forgotten.
 
-You will also need to whitelist the the fly.io app's IP address in MongoDB Atlas. If you don't MongoDB will refuse the connection.
+You will also need to whitelist the fly.io app's IP address in MongoDB Atlas. If you don't MongoDB will refuse the connection.
 
 Sadly, fly.io does not provide you a dedicated IPv4 address for your app, so you will need to allow all IP addresses in MongoDB Atlas.