updated paragraph for clarity and grammar mistakes

Author: ValClarkson

docs/content/guides/major-postgres-version-upgrade.md

@@ -161,7 +161,7 @@ CREATE EXTENSION pgaudit;
 
 `pg_upgrade` may also create a file called `update_extensions.sql` to facilitate extension upgrades. Be aware some of the recommended ways to upgrade may be outdated.
 
-Please carefully review the `update_extensions.sql` file before you run it and, if you want to upgrade `pgaudit` via this file, update the file with the above commands for `pgaudit` prior to execution. After you update the file, you can execute this script using `kubectl exec`, e.g.  We recommend that you verify all extension updates from this file with the appropriate website and their recommendation for upgrading the extension prior to execution.
+Please carefully review the `update_extensions.sql` file before you run it, and if you want to upgrade `pgaudit` via this file, update the file with the above commands for `pgaudit` prior to execution. We recommend verifying all extension updates from this file with the appropriate extension documentation and their recommendation for upgrading the extension prior to execution. After you update the file, you can execute this script using `kubectl exec`, e.g.
 
 ```
 $ kubectl -n postgres-operator exec -it -c database \