Format the table correctly, using cell separators instead of relying

on *roff or mandoc to guess where one cell ends and the next begins.

MFC after:	1 week

lib/libc/sys/sigaction.2

@@ -307,46 +307,109 @@ The following is a list of all signals
 with names as in the include file
 .In signal.h :
 .Bl -column SIGVTALARMXX "create core imagexxx"
-.It Sy "NAME	Default Action	Description"
+.It Sy NAME
-.It Dv SIGHUP No "	terminate process" "	terminal line hangup"
+.Ta Sy Default Action
-.It Dv SIGINT No "	terminate process" "	interrupt program"
+.Ta Sy Description
-.It Dv SIGQUIT No "	create core image" "	quit program"
+.It Dv SIGHUP
-.It Dv SIGILL No "	create core image" "	illegal instruction"
+.Ta terminate process
-.It Dv SIGTRAP No "	create core image" "	trace trap"
+.Ta terminal line hangup
-.It Dv SIGABRT No "	create core image" Ta Xr abort 3
+.It Dv SIGINT
+.Ta terminate process
+.Ta interrupt program
+.It Dv SIGQUIT
+.Ta create core image
+.Ta quit program
+.It Dv SIGILL
+.Ta create core image
+.Ta illegal instruction
+.It Dv SIGTRAP
+.Ta create core image
+.Ta trace trap
+.It Dv SIGABRT
+.Ta create core image
+.Ta Xr abort 3
 call (formerly
 .Dv SIGIOT )
-.It Dv SIGEMT No "	create core image" "	emulate instruction executed"
+.It Dv SIGEMT
-.It Dv SIGFPE No "	create core image" "	floating-point exception"
+.Ta create core image
-.It Dv SIGKILL No "	terminate process" "	kill program"
+.Ta emulate instruction executed
-.It Dv SIGBUS No "	create core image" "	bus error"
+.It Dv SIGFPE
-.It Dv SIGSEGV No "	create core image" "	segmentation violation"
+.Ta create core image
-.It Dv SIGSYS No "	create core image" "	non-existent system call invoked"
+.Ta floating-point exception
-.It Dv SIGPIPE No "	terminate process" "	write on a pipe with no reader"
+.It Dv SIGKILL
-.It Dv SIGALRM No "	terminate process" "	real-time timer expired"
+.Ta terminate process
-.It Dv SIGTERM No "	terminate process" "	software termination signal"
+.Ta kill program
-.It Dv SIGURG No "	discard signal" "	urgent condition present on socket"
+.It Dv SIGBUS
-.It Dv SIGSTOP No "	stop process" "	stop (cannot be caught or ignored)"
+.Ta create core image
-.It Dv SIGTSTP No "	stop process" "	stop signal generated from keyboard"
+.Ta bus error
-.It Dv SIGCONT No "	discard signal" "	continue after stop"
+.It Dv SIGSEGV
-.It Dv SIGCHLD No "	discard signal" "	child status has changed"
+.Ta create core image
-.It Dv SIGTTIN No "	stop process" "	background read attempted from control terminal"
+.Ta segmentation violation
-.It Dv SIGTTOU No "	stop process" "	background write attempted to control terminal"
+.It Dv SIGSYS
-.It Dv SIGIO No "	discard signal" Tn "	I/O"
+.Ta create core image
-is possible on a descriptor (see
+.Ta non-existent system call invoked
+.It Dv SIGPIPE
+.Ta terminate process
+.Ta write on a pipe with no reader
+.It Dv SIGALRM
+.Ta terminate process
+.Ta real-time timer expired
+.It Dv SIGTERM
+.Ta terminate process
+.Ta software termination signal
+.It Dv SIGURG
+.Ta discard signal
+.Ta urgent condition present on socket
+.It Dv SIGSTOP
+.Ta stop process
+.Ta stop (cannot be caught or ignored)
+.It Dv SIGTSTP
+.Ta stop process
+.Ta stop signal generated from keyboard
+.It Dv SIGCONT
+.Ta discard signal
+.Ta continue after stop
+.It Dv SIGCHLD
+.Ta discard signal
+.Ta child status has changed
+.It Dv SIGTTIN
+.Ta stop process
+.Ta background read attempted from control terminal
+.It Dv SIGTTOU
+.Ta stop process
+.Ta background write attempted to control terminal
+.It Dv SIGIO
+.Ta discard signal
+.Ta I/O is possible on a descriptor (see
 .Xr fcntl 2 )
-.It Dv SIGXCPU No "	terminate process" "	cpu time limit exceeded (see"
+.It Dv SIGXCPU
+.Ta terminate process
+.Ta cpu time limit exceeded (see
 .Xr setrlimit 2 )
-.It Dv SIGXFSZ No "	terminate process" "	file size limit exceeded (see"
+.It Dv SIGXFSZ
+.Ta terminate process
+.Ta file size limit exceeded (see
 .Xr setrlimit 2 )
-.It Dv SIGVTALRM No "	terminate process" "	virtual time alarm (see"
+.It Dv SIGVTALRM
+.Ta terminate process
+.Ta virtual time alarm (see
 .Xr setitimer 2 )
-.It Dv SIGPROF No "	terminate process" "	profiling timer alarm (see"
+.It Dv SIGPROF
+.Ta terminate process
+.Ta profiling timer alarm (see
 .Xr setitimer 2 )
-.It Dv SIGWINCH No "	discard signal" "	Window size change"
+.It Dv SIGWINCH
-.It Dv SIGINFO No "	discard signal" "	status request from keyboard"
+.Ta discard signal
-.It Dv SIGUSR1 No "	terminate process" "	User defined signal 1"
+.Ta Window size change
-.It Dv SIGUSR2 No "	terminate process" "	User defined signal 2"
+.It Dv SIGINFO
+.Ta discard signal
+.Ta status request from keyboard
+.It Dv SIGUSR1
+.Ta terminate process
+.Ta User defined signal 1
+.It Dv SIGUSR2
+.Ta terminate process
+.Ta User defined signal 2
 .El
 .Sh NOTE
 The