Add mandoc-manpage for renice(1)

and mark it as finished in README.
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.TH RENICE 1 renice-VERSION "Jun 2013"
renice \- set nice values of running processes
.B renice
.B \-n
.I increment
.B \-g
.B \-p
.B \-u
.I ID...
.Dd January 29, 2015
.Nm renice
.Nd change niceness of processes
.Nm renice
.Fl n Ar inc
.Op Fl g | Fl p | Fl u
.Ar id ...
changes the niceness of each process with the given
.Ar id .
Only the superuser can lower the niceness.
.Bl -tag -width Ds
.It Fl g | Fl p | Fl u
Interpret each
.Ar id
as a process group ID | process ID | user name or ID.
The middle option is default.
.It Fl n Ar inc
Change niceness by
.Ar inc ,
with niceness ranging from
.Sy -20
(highest priority)
.Sy +19
(lowest priority).
.Xr renice 2 ,
.Xr nice 2
.B renice
utility requests that the nice values of one or more
running processes be changed. By default, the applicable processes
are specified by their process IDs. When a process group is specified
.B -g
), the request applies to all processes in the process group. If the
requested increment would raise or lower the nice value of the
executed utility beyond its limits, then the limit whose value was
exceeded is used. When a user is reniced, the request applies to all
processes whose saved set-user-ID matches the user ID corresponding to
the user. Regardless of which options are supplied or any other factor,
renice does not alter the nice values of any process unless the user
requesting such a change has appropriate privileges to do so for the
specified process. If the user lacks appropriate privileges to perform
the requested action, the utility returns an error status.
The saved set-user-ID of the user's process is checked instead of its
effective user ID when renice attempts to determine the user ID of the
process in order to determine whether the user has appropriate privileges.
.B \-g
interpret all operands as unsigned decimal integer process group IDs.
.B \-n
.I increment
specify how the nice value of the specified process or processes
is to be adjusted. The increment option-argument is a positive or
negative decimal integer used to modify the nice value of the
specified process or processes. positive increment values cause a
lower nice value. Negative increment values may require appropriate
privileges and cause a higher nice value.
.B \-p
interpret all operands as unsigned decimal integer process IDs.
.B \-p
option is the default if no options are specified.
.B \-u
interpret all operands as users. If a user exists with a user name
equal to the operand, then the user ID of that user is used in further
processing. Otherwise, if the operand represents an unsigned decimal
integer, used as the numeric user ID of the user.
On successful completion 0 is returned, a value which is >0 is
returned on error.
.I /etc/passwd
used to map user names to user ID's.
.B renice
utility is IEEE Std 1003.1-2001 (POSIX.1) compatible.
.I "renice -n 5 -p 987 32"
Adjust the nice value so that process IDs 987 and 32 would have a
lower nice value.
.I "renice -n -4 -g 324 76"
Adjust the nice value so that group IDs 324 and 76 would have a
higher nice value, if the user has the appropriate privileges to do so.
.I "renice -n 4 -u 8 sas"
Adjust the nice value so that numeric user ID 8 and user sas would
have a lower nice value.
Useful nice value increments on historical systems include
19 or 20 (the affected processes run only when nothing else in the
system attempts to run) and any negative number
(to make processes run faster).
Written by Lorenzo Cogotti.
.BR nice(1)
utility is compliant with the
.St -p1003.1-2008