docs: bring five more man pages closer to standard formatting

Also, for renice, adapt the descriptions to the behaviour: the -g,
-p and -u options do not actually need to be followed by any ID.

Signed-off-by: Benno Schulenberg <bensberg@justemail.net>
docs: bring eight more man pages closer to standard formatting

Also, for chcpu, the options -c, -d, -e and -g are mutually exclusive,
and for the mode argument the option -p is not optional.  For ldattach,
use the standard options separator ", " instead of the unusual " | ".
And add the missing --version to several of the pages.  Besides, improve
the wording and the consistency of the spacing.

Signed-off-by: Benno Schulenberg <bensberg@justemail.net>