x86/sgx: Add a missing colon in kernel-doc markup for "struct sgx_enclave_run"

x86/sgx: Add a missing colon in kernel-doc markup for "struct sgx_enclave_run"

Add a missing ':' for the description of sgx_enclave_run.reserved so that
documentation for the member is correctly generated:

  WARNING: arch/x86/include/uapi/asm/sgx.h:184 struct member 'reserved' not
  described in 'sgx_enclave_run'

Closes: https://lore.kernel.org/all/20251106145506.145fc620@canb.auug.org.au
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Link: https://patch.msgid.link/20251112160708.1343355-2-seanjc%40google.com