MT#62763 perl: Use strictures

Warned-by: perlcritic
Fixes: TestingAndDebugging::RequireUseStrict
Fixes: TestingAndDebugging::RequireUseWarnings
Change-Id: I16443d4ee23042b0908747e67366b903c88ca8cb

doc/munin-sems-stats-monitoring.pl

@@ -1,5 +1,8 @@
 #!/usr/bin/perl
 
+use strict;
+use warnings;
+
 if($ARGV[0] and $ARGV[0] eq 'config') {
         print "graph_title SEMS calls\n";
         print "graph_args --base 1000 -l 0\n";