Document default prio + tag for log redirect option
@@ -341,6 +341,9 @@ syslog using the native `logit` tool. The full syntax is:
log:null
log
+Default `prio` is `daemon.info` and default `tag` is the basename of the
+service or run/task command.
+
Log rotation is controlled using the global `log` setting.
**Example:**
