add generated docs

website/pages/partials/builder/virtualbox/vm/Config-not-required.mdx

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+<!-- Code generated from the comments of the Config struct in builder/virtualbox/vm/config.go; DO NOT EDIT MANUALLY -->
+
+-   `guest_additions_mode` (string) - The method by which guest additions are
+    made available to the guest for installation. Valid options are `upload`,
+    `attach`, or `disable`. If the mode is `attach` the guest additions ISO will
+    be attached as a CD device to the virtual machine. If the mode is `upload`
+    the guest additions ISO will be uploaded to the path specified by
+    `guest_additions_path`. The default value is `upload`. If `disable` is used,
+    guest additions won't be downloaded, either.
+    
+-   `guest_additions_path` (string) - The path on the guest virtual machine
+     where the VirtualBox guest additions ISO will be uploaded. By default this
+     is `VBoxGuestAdditions.iso` which should upload into the login directory of
+     the user. This is a [configuration
+     template](/docs/templates/engine) where the `Version`
+     variable is replaced with the VirtualBox version.
+    
+-   `guest_additions_sha256` (string) - The SHA256 checksum of the guest
+     additions ISO that will be uploaded to the guest VM. By default the
+     checksums will be downloaded from the VirtualBox website, so this only needs
+     to be set if you want to be explicit about the checksum.
+    
+-   `guest_additions_url` (string) - The URL to the guest additions ISO
+     to upload. This can also be a file URL if the ISO is at a local path. By
+     default, the VirtualBox builder will attempt to find the guest additions ISO
+     on the local file system. If it is not available locally, the builder will
+     download the proper guest additions ISO from the internet.
+    
+-   `attach_snapshot` (string) - Default to `null/empty`. The name of an
+     **existing** snapshot to which the builder shall attach the VM before
+     starting it. If no snapshot is specified the builder will simply start the
+     VM from it's current state i.e. snapshot.
+    
+-   `target_snapshot` (string) - Default to `null/empty`. The name of the
+      snapshot which shall be created after all provisioners has been run by the
+      builder. If no target snapshot is specified and `keep_registered` is set to
+      `false` the builder will revert to the snapshot to which the VM was attached
+      before the builder has been executed, which will revert all changes applied
+      by the provisioners. This is handy if only an export shall be created and no
+      further snapshot is required.
+    
+-   `force_delete_snapshot` (bool) - Defaults to `false`. If set to `true`,
+      overwrite an existing `target_snapshot`. Otherwise the builder will yield an
+      error if the specified target snapshot already exists.
+    
+-   `keep_registered` (bool) - Set this to `true` if you would like to keep
+      the VM attached to the snapshot specified by `attach_snapshot`. Otherwise
+      the builder will reset the VM to the snapshot to which the VM was attached
+      before the builder started. Defaults to `false`.
+    
+-   `skip_export` (bool) - Defaults to `false`. When enabled, Packer will
+      not export the VM. Useful if the builder should be applied again on the created
+      target snapshot.
+    

website/pages/partials/builder/virtualbox/vm/Config-required.mdx

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+<!-- Code generated from the comments of the Config struct in builder/virtualbox/vm/config.go; DO NOT EDIT MANUALLY -->
+
+-   `vm_name` (string) - This is the name of the virtual machine to which the
+     builder shall attach.
+    

website/pages/partials/builder/virtualbox/vm/Config.mdx

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+<!-- Code generated from the comments of the Config struct in builder/virtualbox/vm/config.go; DO NOT EDIT MANUALLY -->
+Config is the configuration structure for the builder.