Update u_e-update-hooks.md (#308)

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It is possible to add pre- and post-update-hooks to the `update.sh` script that upgrades your whole mailcow installation.
To do so, just add the corresponding bash script into your mailcows root directory:
To do so, just add the corresponding bash script into your mailcow root directory:
* `pre_update_hook.sh` for commands that should run before the update
* `post_uddate_hook.sh` for commands that should run after the update is completed
* `post_update_hook.sh` for commands that should run after the update is completed
Keep in mind that `pre_update_hook.sh` runs every time you call `update.sh` and `post_update_hook.sh` will only run if the update was successful and the script doesn't have to be re-run.