Documentation: KVM: Fix unexpected unindent warning

Add proper indentations to bullet list item to resolve the warning:
"Bullet list ends without a blank line; unexpected unindent."

Closes:https://lore.kernel.org/kvm/20250623162110.6e2f4241@canb.auug.org.au

Fixes: 4580dbe ("KVM: TDX: Exit to userspace for SetupEventNotifyInterrupt")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com>
Link: https://lore.kernel.org/r/20250701012536.1281367-1-binbin.wu@linux.intel.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: Binbin Wu

Documentation/virt/kvm/api.rst

@@ -7230,8 +7230,8 @@ inputs and outputs of the TDVMCALL.  Currently the following values of
    placed in fields from ``r11`` to ``r14`` of the ``get_tdvmcall_info``
    field of the union.
 
-* ``TDVMCALL_SETUP_EVENT_NOTIFY_INTERRUPT``: the guest has requested to
-set up a notification interrupt for vector ``vector``.
+ * ``TDVMCALL_SETUP_EVENT_NOTIFY_INTERRUPT``: the guest has requested to
+   set up a notification interrupt for vector ``vector``.
 
 KVM may add support for more values in the future that may cause a userspace
 exit, even without calls to ``KVM_ENABLE_CAP`` or similar.  In this case,