man: Fix merge tmpfiles stanza

Fix merge of commit 200c13d8 ("Add tmpfiles stanza for defining tmpfiles.d configurations.")

BUG=b:235148382
TEST=Check with `nroff -man init/man/init.5 | less` the man page looks
fine.

Change-Id: I9481ab52b7c967494ce77c8070a606eeebc7b57a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/upstart/+/4519551
Tested-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Allen Webb <allenwebb@google.com>
Commit-Queue: Gwendal Grignou <gwendal@chromium.org>