Updated default config with null_ident blocking example

RNS/Utilities/rngit/server.py

@@ -4897,6 +4897,11 @@ announce_interval = 360
 
 # blocked_identities = d31aeea49873006f13b3415520666a4e
 
+# To make it easier to handle scrapers, crawlers, slopware
+# and other annoyances, you can block unidentified peers by
+# adding the null_ident hash to to blocked identities.
+
+# blocked_identities = d7db22f63b453c23bb0688dde565b7c1
 
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