fix: Removed trailing backslash (#1471)

Author: fabriziofiorucci

content/nim/disconnected/offline-install-guide.md

@@ -140,7 +140,7 @@ You can find the latest dependencies with one of the following commands:
     -i <path/to/tarball.tar.gz>
     -c <path/to/nginx-repo.crt>
     -k <path/to/nginx-repo.key> \
-    -d <distribution> \
+    -d <distribution>
     ```
 
 3. **Save the admin password**. In most cases, the script completes the installation of NGINX Instance Manager and associated packages. After installation is complete, the script takes a few minutes to generate a password. At the end of the process, you'll see an autogenerated password: