Improve documentation and examples [ci skip]

rootfs/ingress-controller/clean-nginx-conf.sh

@@ -3,6 +3,8 @@
 # This script removes consecutive empty lines in nginx.conf
 # Using sed is more simple than using a go regex
 
-# first sed removes empty lines
-# second sed command replaces the empty lines
-sed -e 's/\r//g' | sed -e 's/^  *$/\'$'\n/g' | sed -e '/^$/{N;/^\n$/d;}'
+# Sed commands:
+# 1. remove the return carrier character/s
+# 2. remove empty lines
+# 3. replace multiple empty lines
+sed -e 's/\r//g' | sed -e 's/^  *$/\'$'\n/g' | sed -e '/^$/{N;/^\n$/D;}'