Added note into sysctl.8 manpage about directory precedence.
This information may be important for users who create new config files at several destinations. Especially the information about files to be omitted in directories with lower priority shall be given.
Print value without new line.
.TP
\fB\-\-system\fR
-Load settings from all system configuration files.
+Load settings from all system configuration files. Files are read from
+directories in the following list in given order from top to bottom.
+Once a file of a given filename is loaded, any file of the same name
+in subsequent directories is ignored.
.br
/run/sysctl.d/*.conf
.br