doc: sys-utils/*: fix some warnings from "mandoc -T lint"

doc: sys-utils/*: fix some warnings from "mandoc -T lint"

mandoc: ./sys-utils/adjtime_config.5:26:1: WARNING: skipping paragraph macro: sp after PP

mandoc: ./sys-utils/chcpu.8:98:2: WARNING: skipping paragraph macro: br at the end of SH

mandoc: ./sys-utils/choom.1:26:22: STYLE: unterminated quoted argument

mandoc: ./sys-utils/dmesg.1:90:5: STYLE: unterminated quoted argument
mandoc: ./sys-utils/dmesg.1:147:5: STYLE: unterminated quoted argument
mandoc: ./sys-utils/dmesg.1:33:2: WARNING: skipping paragraph macro: PP empty
mandoc: ./sys-utils/dmesg.1:255:2: WARNING: skipping paragraph macro: br after sp

mandoc: ./sys-utils/flock.1:183:2: WARNING: line scope broken: TQ breaks TP
mandoc: ./sys-utils/flock.1:43:2: WARNING: skipping paragraph macro: PP after SH

mandoc: ./sys-utils/fsfreeze.8:79:2: WARNING: skipping paragraph macro: PP after SH
mandoc: ./sys-utils/fsfreeze.8:83:2: WARNING: skipping paragraph macro: PP after SH

mandoc: ./sys-utils/ipcmk.1:43:2: WARNING: skipping paragraph macro: PP empty

mandoc: ./sys-utils/lsirq.1:16:11: STYLE: unterminated quoted argument
mandoc: ./sys-utils/lsirq.1:31:11: STYLE: unterminated quoted argument
mandoc: ./sys-utils/lsirq.1:34:11: STYLE: unterminated quoted argument

mandoc: ./sys-utils/mount.8:901:4: STYLE: unterminated quoted argument
mandoc: ./sys-utils/mount.8:2239:38: STYLE: unterminated quoted argument
mandoc: ./sys-utils/mount.8:88:2: WARNING: skipping paragraph macro: br after sp
mandoc: ./sys-utils/mount.8:90:2: WARNING: skipping paragraph macro: br before sp

mandoc: ./sys-utils/mountpoint.1:50:2: WARNING: skipping paragraph macro: PP after SH
mandoc: ./sys-utils/mountpoint.1:57:2: WARNING: skipping paragraph macro: PP after SH

mandoc: ./sys-utils/readprofile.8:10:2: WARNING: skipping paragraph macro: PP after SH
mandoc: ./sys-utils/readprofile.8:100:2: WARNING: skipping paragraph macro: PP after SH

mandoc: ./sys-utils/renice.1:65:11: STYLE: unterminated quoted argument
mandoc: ./sys-utils/renice.1:68:11: STYLE: unterminated quoted argument
mandoc: ./sys-utils/renice.1:72:11: STYLE: unterminated quoted argument
mandoc: ./sys-utils/renice.1:55:2: WARNING: skipping paragraph macro: PP empty

mandoc: ./sys-utils/swapon.8:227:2: WARNING: skipping paragraph macro: br after SH

mandoc: ./sys-utils/unshare.1:350:32: STYLE: unterminated quoted argument
mandoc: ./sys-utils/unshare.1:253:2: WARNING: skipping paragraph macro: PP after SH

####

  The ouput from "nroff" and "groff" is unchanged.

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