Sync up the generated Conduit config for Debian

This applies changes made in the exampl config by commits dc89fbe and
844508b.

debian/postinst

@@ -91,6 +91,11 @@ enable_lightning_bolt = true
 trusted_servers = ["matrix.org"]
 
 #max_concurrent_requests = 100 # How many requests Conduit sends to other servers at the same time
+
+# Controls the log verbosity. See also [here][0].
+#
+# [0]: https://docs.rs/tracing-subscriber/latest/tracing_subscriber/filter/struct.EnvFilter.html#directives
+#log = "..."
 EOF
     fi
     ;;