man: document logging downgrade in systemctl

Fixup for 32458cc968.

diff --git a/man/sysctl.d.xml b/man/sysctl.d.xml
index 32084ee8d6b81d37b064b79edf482d6d0cb058f6..71a236b50b31a7a9924a741baff6b9e5c8789523 100644 (file)
--- a/man/sysctl.d.xml
+++ b/man/sysctl.d.xml
@@ -59,11 +59,12 @@
     <filename>/proc/sys/net/ipv4/conf/enp3s0.200/forwarding</filename>.
     </para>
 
-    <para>Any access permission errors and attempts to write variables not defined on the local system are
-    logged, but do not cause the service to fail. Moreover, if a variable assignment is prefixed with a
-    single <literal>-</literal> character, failure to set the variable will be logged, but will not cause the
-    service to fail. All other errors when setting variables cause the service to return failure at the end
-    (other variables are still processed).</para>
+    <para>Any access permission errors and attempts to write variables not present on the local system are
+    logged, but do not cause the service to fail. Debug log level is used, which means that the message will
+    not show up at all by default. Moreover, if a variable assignment is prefixed with a single
+    <literal>-</literal> character, any failure to set the variable will be logged at debug level, but will
+    not cause the service to fail. All other errors when setting variables are logged with higher priority
+    and cause the service to return failure at the end (other variables are still processed).</para>
 
     <para>The settings configured with <filename>sysctl.d</filename>
     files will be applied early on boot. The network