On my system the sysctl output looks like this:
```
dev.hwpstate_intel.0.epp: 50
dev.hwpstate_intel.0.%parent: cpu0
dev.hwpstate_intel.0.%pnpinfo:
dev.hwpstate_intel.0.%location:
dev.hwpstate_intel.0.%driver: hwpstate_intel
dev.hwpstate_intel.0.%desc: Intel Speed Shift
```
but all the `%` get escaped in the manual page, I'm sure if this is intended.
While here, move the example of `dev.hwpstate_intel.%d.%parent` after the
description to align with others.