[Config] Add Wikipedia link for TZ values (#3891)

generate_config.sh

@@ -170,6 +170,8 @@ SOLR_PORT=127.0.0.1:18983
 REDIS_PORT=127.0.0.1:7654
 
 # Your timezone
+# See https://en.wikipedia.org/wiki/List_of_tz_database_time_zones for a list of timezones
+# Use the row named 'TZ database name' + pay attention for 'Notes' row
 
 TZ=${MAILCOW_TZ}