Subject: docs: remove unnecessary paragraph macros

Subject: docs: remove unnecessary paragraph macros

  Remove a second paragraph macro (.TP, .PP) as it does not change the
output (.SS/.PP) or it adds an extra empty line (.TP/.TP)

  Warning from "mandoc -Tlint":

mandoc: ./sys-utils/hwclock.8.in:299:2: WARNING: line scope broken: TP breaks TP
mandoc: ./sys-utils/hwclock.8.in:459:2: WARNING: skipping paragraph macro: PP after SS
mandoc: ./sys-utils/hwclock.8.in:543:2: WARNING: skipping paragraph macro: PP after SS
mandoc: ./sys-utils/hwclock.8.in:574:2: WARNING: skipping paragraph macro: PP after SS
mandoc: ./sys-utils/hwclock.8.in:673:2: WARNING: skipping paragraph macro: PP after SS
mandoc: ./sys-utils/hwclock.8.in:721:2: WARNING: skipping paragraph macro: PP after SS

Signed-off-by: Bjarni Ingi Gislason <bjarniig@rhi.hi.is>