Explain the example allowlist

Author: jedisct1

dnscrypt-proxy/example-allowed-names.txt

@@ -15,8 +15,14 @@
 ## ads[0-9]*     | matches "ads" followed by one or more digits
 ## ads*.example* | *, ? and [] can be used anywhere, but prefixes/suffixes are faster
 
+
+# That one may be blocked due to 'tracker' being in the name.
 tracker.debian.org
 
+# That one may be blocked due to 'ads' being in the name.
+# However, blocking it prevents all sponsored links from the Google
+# search engine from being opened.
+googleadservices.com
 
 
 ## Time-based rules