ABI: sysfs-platform-intel-pmc: add blank lines to make it valid for ReST

The ReST format requires blank lines before/after identation changes,
for it to properly detect lists.

Fixes: ee7abc10 ("platform/x86: intel_pmc_core: export platform global reset bits via etr3 sysfs file")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/3673e1a255ad4100c933af215b60d68ba126f820.1632740376.git.mchehab+huawei@kernel.org


Signed-off-by: Hans de Goede <hdegoede@redhat.com>