add [options] for pihole restartdns

Signed-off-by: Christian König <ckoenig@posteo.de>

manpages/pihole.8

@@ -1,4 +1,4 @@
-.TH "Pi-hole" "8" "Pi-hole" "Pi-hole" "May 2018"
+.TH "Pi-hole" "8" "Pi-hole" "Pi-hole" "April 2020"
 .SH "NAME"
 
 Pi-hole : A black-hole for internet advertisements
@@ -43,7 +43,7 @@ pihole -g\fR
 .br
 pihole status
 .br
-pihole restartdns\fR
+pihole restartdns\fR [options]
 .br
 \fBpihole\fR (\fBenable\fR|\fBdisable\fR [time])
 .br
@@ -260,9 +260,16 @@ Available commands and options:
       #m                Disable Pi-hole functionality for # minute(s)
 .br
 
-\fBrestartdns\fR
+\fBrestartdns\fR [options]
 .br
-    Restart Pi-hole subsystems
+    Full restart Pi-hole subsystems
+.br
+
+    (restart options):
+.br
+      reload            Updates the lists, flushes dnsmasq 's DNS cache
+.br
+      reload-lists      Only update the lists WITHOUT flushing dnsmasq 's DNS cache
 .br
 
 \fBcheckout\fR [repo] [branch]