cgroup/misc: fix misc_res_type kernel-doc warning

Format the kernel-doc for SCALE_HW_CALIB_INVALID correctly to
avoid a kernel-doc warning:

Warning: include/linux/misc_cgroup.h:26 Enum value
 'MISC_CG_RES_TDX' not described in enum 'misc_res_type'

Fixes: 7c035bea ("KVM: TDX: Register TDX host key IDs to cgroup misc controller")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Tejun Heo <tj@kernel.org>