refactoring changes from sequpgrade (endReturn, ...) and some modernizations

seqs/certbot.cfg.example

@@ -2,7 +2,7 @@
 
 # Web root path where certbot will place the ACME challenge files
 #
-# A nginx example location which needs to placed in the server config listening on port 80 
+# A nginx example location which needs to placed in the server config listening on port 80
 # for the first time and also in the config listeing on port 443 for renewals:
 #
 # location ^~ /.well-known/acme-challenge/ {