vboxmanage: update page; vboxmanage-{controlvm, extpack, list, showvminfo, startvm}: add page (#11667)

* vboxmanage: update page; vboxmanage-{controlvm, extpack, list, showvminfo, startvm}: add page

---------

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: Juri Dispan <juri.dispan@posteo.net>
Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>

pages/common/vboxmanage.md

@@ -2,32 +2,21 @@
 
 > Command-line interface to VirtualBox.
 > Includes all the functionality of the GUI and more.
+> Some subcommands such as `vboxmanage startvm` have their own usage documentation.
 > More information: <https://www.virtualbox.org/manual/ch08.html#vboxmanage-intro>.
 
-- List all VirtualBox virtual machines:
+- Display version:
 
-`VBoxManage list vms`
+`VBoxManage --version`
 
-- Show information about a particular virtual machine:
+- Display help:
 
-`VBoxManage showvminfo {{name|uuid}}`
+`VBoxManage --help`
 
-- Start a virtual machine:
+- Display help for a VBoxManage subcommand (like `starvm`, `clonevm`, `import`, `export`, etc.):
 
-`VBoxManage startvm {{name|uuid}}`
+`VBoxManage --help {{subcommand}}`
 
-- Start a virtual machine in headless mode:
+- Execute a VboxManage subcommand:
 
-`VBoxManage startvm {{name|uuid}} --type headless`
-
-- Shutdown the virtual machine and save its current state:
-
-`VBoxManage controlvm {{name|uuid}} savestate`
-
-- Shutdown down the virtual machine without saving its state:
-
-`VBoxManage controlvm {{name|uuid}} poweroff`
-
-- Update VBox extension packs:
-
-`VBoxManage extpack install --replace {{VboxExtensionPackFileName}}`
+`VBoxManage {{subcommand}}`