Add documentation

docs/how-to-reload-fpm.md

@@ -1,6 +1,6 @@
 # How to reload php-fpm?
 
-In order to reload php-fpm after each deployment, you will need to add the `fpm:reload` task at the end of your deployment flow. You also have to set up which version of php-fpm you are using.
+In order to reload php-fpm after each deployment, you will need to add the `fpm:reload` task at the end of your deployment flow (including, if necessary, rolling back to a previous version). You also have to set up which version of php-fpm you are using.
 
 ```php
 // config/deploy.php
@@ -10,6 +10,7 @@ In order to reload php-fpm after each deployment, you will need to add the `fpm:
 ],
 'hooks' => [
     'done' => ['fpm:reload'],
+    'rollback' => ['fpm:reload'],
 ],
 ```
 
@@ -21,4 +22,4 @@ If you wish to customize the command executed by `fpm:reload`, you can override
 'options' => [
     'php_fpm_command' => 'echo "" | sudo -S /usr/sbin/service {{php_fpm_service}} reload',
 ],
-```
+```

docs/overview-getting-started.md

@@ -109,6 +109,11 @@ Before starting you first deployment, you should go check your `config/deploy.ph
 
         // Deployment failed. This can happen at any point of the deployment.
         'fail' => [],
+
+        // After a deployment has been rolled back.
+        'rollback' => [
+            'fpm:reload',
+        ],
     ],
 ```