o split a sentence to make it more understandable

o mention that the acctfile has to exist for accton to work [1]
o add reference to acct.5

PR:             65071 [1] (slightly modified)
Submitted by:   Marc Silver <marcs@draenor.org>
X-MFC after:	re approval

1 files changed, 8 insertions, 2 deletions

diff --git a/usr.sbin/accton/accton.8 b/usr.sbin/accton/accton.8
index 20eb45a54b0c..73c7d2926113 100644
--- a/usr.sbin/accton/accton.8
+++ b/usr.sbin/accton/accton.8
@@ -16,8 +16,13 @@ utility is used
 for switching system accounting on or off.
 If called with the argument
 .Ar acctfile ,
-system accounting is enabled and a record of
-every process that is started by the
+system accounting is enabled.
+The
+.Ar acctfile
+specified must exist prior to starting system accounting, or
+.Nm
+will return an error.
+A record of every process that is started by the
 .Xr execve 2
 system call and then later exits the system is stored in
 .Ar acctfile .
@@ -33,4 +38,5 @@ default accounting file
 .Sh SEE ALSO
 .Xr lastcomm 1 ,
 .Xr acct 2 ,
+.Xr acct 5 ,
 .Xr sa 8