example.conf: python code sample for cookie_salt generation

example.conf

@@ -15,6 +15,7 @@
 # startup, invalidating the cookie sessions.
 # If you enable this, you want to generate your own salt.
 # Has to be 32 bytes in hex format.
+# generate with python: secrets.token_hex(32)
 #cookie_salt = "00112233445566778899aabbccddeeff00112233445566778899aabbccddeeff";
 
 #mqtt = {