Improve man pihole restartdns section.

Signed-off-by: DL6ER <dl6er@dl6er.de>

manpages/pihole.8

@@ -257,14 +257,14 @@ Available commands and options:
 
 \fBrestartdns\fR [options]
 .br
-    Full restart Pi-hole subsystems
+    Full restart Pi-hole subsystems. Without any options (see below) a full restart causes config file parsing and history re-reading
 .br
 
     (restart options):
 .br
-      reload            Updates the lists and flushes DNS cache
+      reload            Updates the lists (incl. HOSTS files) and flushes DNS cache. Does not reparse config files
 .br
-      reload-lists      Updates the lists WITHOUT flushing the DNS cache
+      reload-lists      Updates the lists (excl. HOSTS files) WITHOUT flushing the DNS cache. Does not reparse config files
 .br
 
 \fBcheckout\fR [repo] [branch]