chore(storage): update docs

Author: ka-myl

docs/upctl_storage_modify.md

@@ -16,13 +16,14 @@ upctl storage modify "My Storage" --size 25
 ### Options
 
 ```
-      --title string             A short, informational description.
-      --size int                 Size of the storage (GiB).
-      --backup-time string       The time when to create a backup in HH:MM. Empty value means no backups.
-      --backup-interval string   The interval of the backup.
-                                 Available: daily,mon,tue,wed,thu,fri,sat,sun
-      --backup-retention int     How long to store the backups in days. The accepted range is 1-1095.
-  -h, --help                     help for modify
+      --title string                          A short, informational description.
+      --size int                              Size of the storage (GiB).
+      --backup-time string                    The time when to create a backup in HH:MM. Empty value means no backups.
+      --backup-interval string                The interval of the backup.
+                                              Available: daily,mon,tue,wed,thu,fri,sat,sun
+      --backup-retention int                  How long to store the backups in days. The accepted range is 1-1095.
+      --enable-filesystem-autoresize[=true]   Enable automatic resize of partition and filesystem when modifying storage size. Note that before the resize attempt is made, backup of the storage will be taken. If the resize attempt fails, the backup will be used to restore the storage and then deleted. If the resize attempt succeeds, backup will be kept. Taking and keeping backups incure costs..
+  -h, --help                                  help for modify
 ```
 
 ### Options inherited from parent commands
@@ -40,4 +41,4 @@ upctl storage modify "My Storage" --size 25
 
 * [upctl storage](upctl_storage.md)	 - Manage storages
 
-###### Auto generated by spf13/cobra on 20-Apr-2022
+###### Auto generated by spf13/cobra on 21-Apr-2022