Update website/docs/maintenance/upgrading_postgres.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: brianmay

website/docs/maintenance/upgrading_postgres.md

@@ -18,7 +18,7 @@ you might need to make adjustments. For example, older installed might call the
    ````
 
 2. Check to make sure there are no obvious errors in this backup file. There should not be any errors appearing
-   on screen. The file should be more then 0 bytes long. Do not proceed if there is any doubt.
+   on screen. The file should be more than 0 bytes long. Do not proceed if there is any doubt.
 
 3. Stop all TeslaMate containers