add new perfdata max length configuration items to example config

Author: Ahmet Oeztuerk

config.gcfg.example

@@ -68,6 +68,10 @@
     Folder = "/var/spool/nagios"
     # This option takes predence over Main.NagiosSpoolfileWorker if set
     WorkerCount = 1
+    PerfdataLabelMaxLength = 32
+    PerfdataUOMMaxLength = 16
+    PerfdataNumericValuesMaxLength = 32
+    PerfdataThresholdsMaxLength = 64
 
 [NagfluxSpoolfile]
     Enabled = true